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69 (sixty-nine) is a number following 68 and preceding 70.

In mathematics

The aliquot sum of sixty-nine is 27 within the aliquot sequence (69,27,13,1,0) 69 being the third composite number in the 13-aliquot tree.

69 is a semiprime. Furthermore, since the two factors of 69 are both Gaussian primes, 69 is a Blum integer.

Adding up the divisors of 1 through 9 gives 69.

Because 69 has an odd number of 1s in its binary representation, it is sometimes called an "odious number." Of note is that 69² (4 761) and 69³ (328 509) uses every digit from 0-9. 69 is equal to 105 octal, while 105 is equal to 69 hexadecimal. This same property can be applied to all numbers from 64 to 69.

On many handheld scientific and graphing calculators, the highest factorial that can be computed within memory limitations is 69! or 1.711224524*1098.

The number 69 can be rotated 180° and remain the same.

In science



Astronomy



In sports

  • In cricket, 69 is the number of the South African all-rounder Lance Klusener.
  • In the NHL, the number 69 has only been worn by one player, Mel Angelstad. He played a total of 2 games in his NHL career. It took over 80 years for a player to wear this number.


Popular culture

  • The number 69 is often considered to have sexual connotations due to the sex position of the same name where two persons perform oral sex upon each other simultaneously.
  • The number 69 is also related to the now demolished Ungdomshusetmarker in Copenhagen, Denmark.
  • Thai film named Ruang Talok 69
  • The Professional Wrestling stable D-Generation X of the WWE sold Football jerseys that read at the back "Degenerate: 69". The jersey was appropriate since most of DX's promo/backstage work contained sexual annotations/references.
  • A song written by alternative rock band R.E.M. by the title of "Star 69".
  • The hit song 96 Tears by Question Mark & The Mysterians was originally called 69 Tears.
  • 69 is the lucky number of both Bill and Ted, as discovered when (future) Bill and Ted correctly tell (present) Bill and Ted what their lucky number is in Bill and Ted's Excellent Adventure outside the Circle-K.
  • The band "Seether" has a song called 69 Tea.
  • T-Pain has a song called 69 in his album Epiphany.


In other fields

Sixty-nine may also refer to:
  • The registry of the U.S. Navy's aircraft carrier USS Dwight D. Eisenhower (CVN-69), named after Dwight D. Eisenhower, the 34th President of the United States and five-star general in the United States Army
  • The number of the French department Rhônemarker



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