66 (number)

66 is the natural number following 65 and preceding 67.

Template:Numbers 60s
Cardinal	sixty-six
Ordinal	66th (sixty-sixth)
Factorization	$2\cdot 3\cdot 11$
Divisors	2, 3, 11, 22, 33
Roman numeral	LXVI
Binary	1000010
Hexadecimal	42

Mathematics

66 is a sphenic number, a triangular number, a hexagonal number, and a semi-meandric number.

Other fields

66 is also:

• The atomic number of dysprosium, a lanthanide.
• The designation of the historic Route 66, dubbed the "Mother Road" by novelist John Steinbeck.
• The designation of US Interstate 66, a freeway that runs from Virginia to Washington, D.C..
• The number of the French department Pyrénées-Orientales.
• The international direct dialling (IDD) code for Thailand.
• The year AD 66, 66 BC, or 1966.