the twentieth
semiprime (3.23)[2] and the seventh of the form (3.q) where q is a higher prime.[3]
the
aliquot sum of sixty-nine is
27 within the aliquot sequence (69,
27,
13,
1,0) and is the third
composite number in the
13-aliquot tree; following (
27,
35).
Because 69 has an odd number of 1s in its binary representation, it is sometimes called an "
odious number."
In decimal, 69 is the only natural number whose square (4761) and cube (328509) use every digit from 0–9 exactly once.[7]
69 is equal to
105octal, 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 calculated, due to memory limitations, is 69!, or about 1.711224524×1098.
69ing, a sex position involving each partner aligning themselves to achieve oral sex simultaneously with each other.
In reference to the sex position, "69" has become an
Internet meme, where users will respond to any occurrence of the number with the word "nice" to draw specific attention to it. This means to humorously imply that the reference to the sex position was intentional. Because of its association with the sex position and resulting meme, "69" has been named "the sex number".[8]
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
Rhône. The
Lyon Metropolis, which was separated from the Rhône department in 2015, is designated as "69M". The
postal codes for both entities start with "69".
The last possible
television channel number in the
UHF bandplan for American terrestrial television from 1982 until its withdrawal on December 31, 2011.