69 (number)

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← 68 69 70 →
Cardinalsixty-nine
Ordinal69th
(sixty-ninth)
Factorization3 × 23
Divisors1, 3, 23, 69
Greek numeralΞΘ´
Roman numeralLXIX
Binary10001012
Ternary21203
Senary1536
Octal1058
Duodecimal5912
Hexadecimal4516

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

In mathematics

69 is:

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 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 1.711224524×1098.

In science

Astronomy

In other fields

Sixty-nine may also refer to:

  • 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
    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
    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 Taijitu
  • The last possible television channel number in the UHF bandplan for American terrestrial television from 1982 until its withdrawal on December 31, 2011.

References

  1. ^ "Sloane's A000959 : Lucky numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  2. ^ "Sloane's A001358".
  3. ^ Sloane, N. J. A. (ed.). "Sequence A001748". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  4. ^ "Sloane's A016105 : Blum integers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  5. ^ Sloane, N. J. A. (ed.). "Sequence A024916 (sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  6. ^ Sloane, N. J. A. (ed.). "Sequence A000787 (Strobogrammatic numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-07.
  7. ^ David Wells: The Penguin Dictionary of Curious and Interesting Numbers
  8. ^ Feldman, Brian (2016-06-09). "Why 69 Is the Internet's Coolest Number (Sex)". Intelligencer. Retrieved 2020-09-04.

External links