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Number 66

66 is the natural number following 65 and preceding 67.

List of numbers — Integers << 60 61 62 63 64 65 66 67 68 69 >>
Cardinal	sixty-six
Ordinal	66th (sixty-sixth)
Factorization	<math>2 \cdot 3 \cdot 11<math>
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.