+66 is the natural number following 65 and preceding 67, an [even number](/wiki/Even_number) with unique mathematical properties. It is a [composite number](/wiki/Composite_number) and the eleventh triangular number, appearing in various sequences and cultural contexts.
+## See also
+- [Number](/wiki/Number)
+- [Triangular Number](/wiki/Triangular_Number)
+- [Route 66](/wiki/Route_66)
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