69 (number)

69 is the natural number following 68 and preceding 70.

Template:Numbers 60s
Cardinal	sixty-nine
Ordinal	69th (sixty-ninth)
Factorization	$3\cdot 23$
Roman numeral	LXIX
Binary	1000101
Hexadecimal	45

It is the largest number whose factorial is less than 10¹⁰⁰ (69! ≈ 1.71x10⁹⁸). This means it is often the largest factorial that can be calculated by a pocket calculator.

It also has the amusing property of being the only number whose square and cube contain once and only once all numerals from zero to nine :

• 69² = 4761
• 69³ = 328509

Sixty-nine is:

• The atomic number of thulium, a lanthanide.
• The name of the 69 sex position.
• Part of the title of 69 Année érotique by Serge Gainsbourg.
• The designation of US Interstate 69, a freeway that runs from Indiana to Michigan.
• The registry of the U.S. Navy's nuclear aircraft carrier USS Dwight D. Eisenhower (CVN-69), named after U.S. President Dwight D. Eisenhower.
• In the name of a brand of whisky, Vat 69.
• The number of the French department Rhône.
• In Bill & Ted's Excellent Adventure, the number past and present Bill and Ted are thinking of when questioned by future Bill and Ted to confirm their identity
• The year AD 69, 69 BC, or 1969.
• The highest numbered channel on the UHF analog television broadcast spectrum, after the spectrum previously assigned to channels 70-83 was reallocated for use by cellular phone services.