69 (sixty-nine) is a number following 68 and preceding 70.
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. 69 is a lucky number. Because 69 has an odd number of 1s in its binary representation, it is sometimes called an "odious number." Of note is that 692 (4761) and 693 (328509) together use every decimal 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 calculated, due to memory limitations, is 69! or about 1.711224524×10^98. 69 is the smallest number where n^2 and n^3 contain all digits exactly once.
Poor old guy, doesn't know how 69 really great is.
by youmayhaveheardofme January 15, 2016
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Sixty-nine or 69, also known by its French name soixante-neuf is a group of sex positions in which two people align themselves so that each person's mouth is near the other's genitals, each simultaneously performing oral sex on the other. The participants are thus mutually inverted like the numerals 6 and 9 in the number 69, hence the name. This position can involve any combination of sexes.
by BigdickMurphy October 17, 2020
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Simultaneous oral sex. Can be practised by M+M, M+F or F+F.

The reference is that the numerals 6 and 9 are inverted versions of each other, reflecting the physical position that the couple must adopt when engaged in this sexual practice.
The two girls were in a 69, licking each other's pussies.
by starflier December 8, 2003
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a sexual position when a man sucks on a woman's pussy and the woman gives the man a blowjob at the same time. P.S. it's also extremely hot.
I just did a 69 with my girlfriend last night and it was so hot.
by sunnynoodlerice January 2, 2018
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a really overrated number that boys obsess over. this should stop
cade: I came back to 69 messages on my phone
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