63 (number)
Sixty-three is a natural number following 62 and preceding 64.
| |||
| Cardinal | sixty-three | ||
| Ordinal | 63rd (sixty-third) | ||
| Factorization | 
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| Divisors | 3, 7, 9, 21 | ||
| Roman numeral | LXIII | ||
| Binary | 111111 | ||
| Hexadecimal | 3F | ||
In mathematics
Although a number of the form 2n - 1, 63 is technically not a Mersenne number since n is not prime and 63 is certainly not prime either. It is a Woodall number and a Harshad number. It is a highly cototient number.
In science
- The atomic number of europium, a lanthanide
In astronomy,
- Messier object M63, a magnitude 8.5 galaxy in the constellation Canes Venatici, also known as the Sunflower Galaxy.
- The New General Catalogue object NGC 63, a spiral galaxy in the constellation Pisces
- The Saros number of the solar eclipse series which began on -879 April 20 and ended on 401 May 29. The duration of Saros series 63 was 1280.1 years, and it contained 72 solar eclipses.
- The Saros number of the lunar eclipse series which began on -758 October 12 and ended on 739 March 29. The duration of Saros series 63 was 1496.5 years, and it contained 84 lunar eclipses.
In other fields
Sixty-three is:
- The code for international direct dial calls to the Philippines.
- The registry of the U.S. Navy's aircraft carrier USS Kitty Hawk (CV-63).
- The number of the French department Puy-de-Dôme.
- The year AD 63, 63 BC, or 1963.