55 (Number)

55 is the natural number following 54 and preceding 56.
Cardinalfifty-five
Ordinal55th (fifty-fifth)
Factorization5\cdot 11
Roman numeralLV
Binary110111
Hexadecimal37

In mathematics

Fifty-five is a heptagonal number, a centered nonagonal number, and a triangular number, made up of the numbers 1 to 10 added up, and it is also the sum of the squares of the integers 1 to 5. It is also a Fibonacci number (the largest Fibonacci number to also be a triangular number) and a Kaprekar number.

In science

In 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
The Saros number of the solar eclipse series which began on -1255 July 6 and ended on 43 August 23. The duration of Saros series 55 was 1298.1 years, and it contained 73 solar eclipses.
The Saros number of the lunar eclipse series which began on -935 April 25 and ended on 345 June 1. The duration of Saros series 55 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

Fifty-five is also:

 

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