1,000,000,000

• 10⁹ seconds (1 gigasecond) equal 11,574 days, 1 hour, 46 minutes and 40 seconds (approximately 31.7 years, or 31 years, 8 months, 8 days).
• About 10⁹ minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10⁹ minutes is roughly 1,901 years.)
• About 10⁹ hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (10⁹ hours is roughly 114,080 years.)
• About 10⁹ days ago, Australopithecus, an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (10⁹ days is roughly 2.738 million years.)
• About 10⁹ months ago, dinosaurs walked the Earth during the late Cretaceous. (10⁹ months is roughly 83.3 million years.)
• About 10⁹ years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth.
• About 10⁹ decades ago, galaxies began to appear in the early Universe which was then 3.799 billion years old. (10⁹ decades is exactly 10 billion years.)
• The universe is thought to be about 13.8 × 10⁹ years old.[6]

• 10⁹ inches is 15,783 miles (25,400 km), more than halfway around the world and thus sufficient to reach any point on the globe from any other point.
• 10⁹ metres (called a gigametre) is almost three times the distance from the Earth to the Moon.
• 10⁹ kilometres (called a terametre) is over six times the distance from the Earth to the Sun.

• A billion square inches would be a square about one half mile on a side.
• A bolt of finely woven 1000-TC bed sheet linen with a billion thread crossings would have an area of 40 square metres (48 sq yd), comparable to the floor area of a motel unit.

• There are a billion cubic millimetres in a cubic metre, and a billion cubic metres in a cubic kilometre.
• A billion grains of table salt or granulated sugar would occupy a volume of about 2.5 cubic feet (0.071 m³).
• A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.

• Any object that weighs one billion kilograms (2.2×10⁹ lb) would weigh about as much as 5,525 empty Boeing 747-400s.
• A cube of iron that weighs one billion pounds (450,000,000 kg) would be 38.62 metres (126.7 ft) on each side.

• As of July 2016, Apple has sold one billion iPhones.[7] This makes the iPhone one of the most successful product lines in history, surpassing the PlayStation and the Rubik's Cube.
• As of July 2016, Facebook has 1.71 billion users.[8]

• A small mountain, slightly larger than Stone Mountain in Georgia, United States, would weigh (have a mass of) a billion tons.
• There are billions of worker ants in the largest ant colony in the world,[9] which covers almost 4,000 miles (6,400 km) of the Mediterranean coast.
• In 1804, the world population was one billion.

A is a cube; B consists of 1000 cubes the size of cube A, C consists of 1000 cubes the size of cube B; and D consists of 1000 cubes the size of cube C. Thus there are 1 million A-sized cubes in C; and 1,000,000,000 A-sized cubes in D.

• 1,000,000,007 – smallest prime number with 10 digits.[10]
• 1,000,006,281 – smallest triangular number with 10 digits and the 44,721st triangular number.
• 1,000,014,129 – smallest ten-digit square.
• 1,023,456,789 – smallest pandigital number in base 10.
• 1,026,753,849 – smallest pandigital square that includes 0.
• 1,073,676,287 – 15th Carol number.[11]
• 1,073,741,824 – 2³⁰
• 1,073,807,359 – 14th Kynea number.[12]
• 1,111,111,111 – repunit, also a special number relating to the passing of Unix time.
• 1,129,760,415 – 23rd Motzkin number.[13]
• 1,134,903,170 – 45th Fibonacci number.
• 1,162,261,467 – 3¹⁹
• 1,220,703,125 – 5¹³
• 1,232,922,769 – Centered hexagonal number.
• 1,280,000,000 – 20⁷
• 1,234,567,890 – pandigital number with the digits in order.
• 1,311,738,121 – 25th Pell number.[14]
• 1,382,958,545 – 15th Bell number.[15]
• 1,406,818,759 – 30th Wedderburn–Etherington number.[16]
• 1,427,647,786 – Population of the People's Republic of China in 2018.[17][18]
• 1,475,789,056 – 14⁸
• 1,631,432,881 – Triangular square number.
• 1,673,196,525 – Lowest common multiple of the odd integers from 1 to 25
• 1,787,109,376 – 1-automorphic number[19]
• 1,836,311,903 – 46th Fibonacci number.
• 1,882,341,361 – The smallest prime whose reversal is both square (40391²) and triangular (triangular of 57121).
• 1,977,326,743 – 7¹¹

• 2,038,074,743 – 100,000,000th prime number
• 2,147,483,647 – 8th Mersenne prime and the largest signed 32-bit integer.
• 2,147,483,648 – 2³¹
• 2,176,782,336 – 6¹²
• 2,214,502,422 – 6th primary pseudoperfect number.[20]
• 2,357,947,691 – 11⁹
• 2,562,890,625 – 15⁸
• 2,971,215,073 – 11th Fibonacci prime (47th Fibonacci number).

• 3,166,815,962 – 26th Pell number.[14]
• 3,192,727,797 – 24th Motzkin number.[13]
• 3,323,236,238 – 31st Wedderburn–Etherington number.[16]
• 3,405,691,582 – hexadecimal CAFEBABE; used as a placeholder in programming.
• 3,405,697,037 – hexadecimal CAFED00D; used as a placeholder in programming.
• 3,486,784,401 – 3²⁰
• 3,735,928,559 – hexadecimal DEADBEEF; used as a placeholder in programming.
• 3,735,929,054 – hexadecimal DEADC0DE; used as a placeholder in programming.

• 4,294,836,223 – 16th Carol number.[11]
• 4,294,967,291 – Largest prime 32-bit unsigned integer.
• 4,294,967,295 – Maximum 32-bit unsigned integer (FFFFFFFF₁₆), perfect totient number, product of the five prime Fermat numbers ${\displaystyle F_{0}}$ through ${\displaystyle F_{4}}$.
• 4,294,967,296 – 2³²
• 4,294,967,297 – ${\displaystyle F_{5}}$, the first composite Fermat number.
• 4,295,098,367 – 15th Kynea number.[12]
• 4,807,526,976 – 48th Fibonacci number.

• 5,159,780,352 – 12⁹
• 5,354,228,880 – superior highly composite number, smallest number divisible by all the numbers 1 through 24
• 5,784,634,181 – 13th alternating factorial.[21]

• 6,103,515,625 – 5¹⁴
• 6,210,001,000 – only self-descriptive number in base 10.
• 6,227,020,800 – 13!
• 6,975,757,441 – 17⁸
• 6,983,776,800 – 15th colossally abundant number,[22] 15th superior highly composite number[23]

• 7,645,370,045 – 27th Pell number.[14]
• 7,778,742,049 – 49th Fibonacci number.
• 7,862,958,391 – 32nd Wedderburn–Etherington number.[16]

• 8,212,890,625 – 1-automorphic number[19]
• 8,589,869,056 – 6th perfect number.[24]
• 8,589,934,592 – 2³³

• 9,043,402,501 – 25th Motzkin number.[13]
• 9,814,072,356 – largest square pandigital number, largest pandigital pure power.
• 9,876,543,210 – largest number without redundant digits.
• 9,999,999,967 – greatest prime number with 10 digits[25]