66 (sixty-six) is the natural number following 65 and preceding 67. In mathematics 66 is a sphenic number, a semiperfect number, and a Erdős–Woods number. It is…
66 (sixty-six) is the natural number following 65 and preceding 67.
In mathematics 66 is a sphenic number, a semiperfect number, and a Erdős–Woods number. It is also the 11th triangular number and the 6th hexagonal number.
See also 66 (disambiguation)
References
External links
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