|Factorization||32 × 7|
|Divisors||1, 3, 7, 9, 21, 63|
- a deficient composite number.
- a highly cototient number.
- a number of the form 2n − 1 (with n = 6), but it is not a Mersenne prime since n is not prime and 63 is certainly not prime either. It is the only number in the Mersenne sequence whose prime factors are each factors of at least one previous element of the sequence.
- a Woodall number i.e. of the form 2nn − 1 with n = 4.
- the third Delannoy number.
- the sum of the powers of 2 from 0 to 5.
- palindromic and a repdigit in bases 2 (1111112), 4 (3334), 8 (778), 20 (3320) and 62 (1162).
In other fieldsEdit
Sixty-three is also:
- The code for international direct dial calls to the Philippines
- The hull number of the U.S. Navy's aircraft carrier USS Kitty Hawk (CV-63) and the USS Missouri (BB-63)
- The number of the French department Puy-de-Dôme
- The number of groats in a guinea in British pre-decimal currency
- A card game, popular in Carleton County, New Brunswick
- The Stoner 63, a machine gun
- The number of chromosomes found in the offspring of a donkey and a horse
- Class of '63 was a TV movie starring James Brolin (1973)
- Tom Dempsey of New Orleans Saints, Nov. 8, 1970, Jason Elam of the Denver Broncos, Oct. 25, 1988, Sebastian Janikowski of the Oakland Raiders, Sep. 12, 2011 and David Akers of the San Francisco 49ers, Sept. 9, 2012 had NFL record 63-yard field goals
- Michael Jordan scored a record 63 points in a Chicago Bulls –Boston Celtics (double-overtime) NBA playoff game on April 20, 1986
- In U.S. college athletics, schools that are members of NCAA Division I FCS are allowed to provide their football players with athletically-related financial aid equivalent to a total of 63 full athletic scholarships in a given season.
- Cricketer Phillip Hughes died during a match whilst on a personal score of 63 runs.
- "Sloane's A100827 : Highly cototient numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A003261 : Woodall numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A001850 : Central Delannoy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.