55 (number)
55 (fifty-five) is the natural number following 54 and preceding 56.
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| Cardinal | fifty-five | |||
| Ordinal | 55th (fifty-fifth) | |||
| Factorization | 5 × 11 | |||
| Divisors | 1, 5, 11, 55 | |||
| Greek numeral | ΝΕ´ | |||
| Roman numeral | LV | |||
| Binary | 1101112 | |||
| Ternary | 20013 | |||
| Octal | 678 | |||
| Duodecimal | 4712 | |||
| Hexadecimal | 3716 | |||
Mathematics
55 is the 10th Fibonacci number,[1] a triangular number (the sum of the consecutive numbers 1 to 10), and a doubly triangular number.[2] It is the largest Fibonacci number to also be a triangular number.
It is a square pyramidal number (the sum of the squares of the integers 1 to 5)[3] as well as a heptagonal number,[4] and a centered nonagonal number.[5]
In base 10, it is a Kaprekar number.[6]
Science
- The atomic number of caesium.
Astronomy
- Messier object M55, a magnitude 7.0 globular cluster in the constellation Sagittarius
- The New General Catalogue object NGC 55, a magnitude 7.9 barred spiral galaxy in the constellation Sculptor
Music
- The name of a song by Kasabian. The song was released as a B side to Club Foot and was recorded live when the band performed at London's Brixton Academy.
- "I Can't Drive 55", a song by Sammy Hagar
- "Ol' '55", a song by Tom Waits
- Ol' 55 (band), an Australian rock band.
- Primer 55 an American band
- Station 55, an album released in 2005 by Cristian Vogel
- 55 Cadillac, an album by Andrew W.K.
Transportation
- In the United States, the National Maximum Speed Law prohibited speed limits higher than 55 miles per hour (90 km/h) from 1974 to 1987
Film
- 55 Days at Peking a film starring Charlton Heston and David Niven
Other uses
- Gazeta 55, an Albanian newspaper
- Agitation and Propaganda against the State, also known as Constitution law 55, a law during Communist Albania.
- The code for international direct dial phone calls to Brazil
- A 55-gallon drum; see 44 gallon drum
- The Élysée, the official residency of the French Republic president, which address is 55 rue du Faubourg-Saint-Honoré in Paris.
- The number of the laps of the Abu Dhabi Grand Prix.
See also
- 55th Regiment of Foot (disambiguation)
- Channel 55 (disambiguation)
- Type 55 (disambiguation)
- Class 55 (disambiguation)
- List of highways numbered 55
References
- "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A000217 : Triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A000330 : Square pyramidal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A000566 : Heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A060544 : Centered 9-gonal (also known as nonagonal or enneagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
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