Sixty-six
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Sixty-six (66, LXVI) is a natural number following sixty-five and preceding sixty-seven. It is a composite number with the divisors being 2, 3, 11, 22 and 33. It is a sphenic number. Its factorization is:

It is a triangular number, a hexagonal number and a 23-agonal number.

Sixty-six 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.

This article is about the number 66. For the year AD 66, see 66.

The original article can be found at: http://en.wikipedia.org/wiki/Sixty-six.
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