69 (number)

Template:Numbers 60s
Cardinal	69 sixty-nine
Ordinal	69th sixty-ninth
Numeral system	sexagesimal
Factorization	$3\cdot 23$
Divisors	1, 3, 23, 69
Roman numeral	LXIX
Binary	1000101
Octal	105
Duodecimal	59
Hexadecimal	45

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

In mathematics

• 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 69³² = 6969007... and 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.
• 69 is a semiprime.
• On many handheld scientific and graphing calculators, the highest factorial that can be computed within memory limitations is 69! or 1.711224524*10⁹⁸.

In science

• The atomic number of thulium, a lanthanide

Astronomy

• The Messier object M69 is a magnitude 9.0 globular cluster in the constellation Sagittarius.

In Sports

• In cricket, 69 is the number of the South African all-rounder Lance Klusener.

Popular culture

• The number 69 is often considered to have sexual connotations due to the sex position of the same name where two persons of either same or differing sexes perform oral sex upon each other.
• The number 69 is also related to the now demolished Ungdomshuset in Copenhagen, Denmark.
• Thai film named Ruang Talok 69