Monday, July 7, 2014

6661

6661 is a prime number.

6659 and 6661 form a twin prime pair.

6661 is the smallest beastly (containing the string 666) prime number.

6661 and its inversion, 1999, are both primes.

6661 uses only the digits 0, 1, and 5 in bases 6 (50501) and 8 (15005).

6661 has a representation as a sum of two squares: 6661 = 102 + 812.

6661 is the hypotenuse of a primitive Pythagorean triple: 66612 = 16202 + 64612.


Source: Number Gossip

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