6661

This number is a prime.

+ The smallest beastly prime is also an invertible prime (1999).

+ The sum of cube of factorial of digits of the smallest beastly prime (6!^3 + 6!^3 + 6!^3 + 1!^3) yields an emirp. [Bajpai]

+ The smallest beastly prime is also "lucky." [Gaydos]

+ The first 4-digit beastly invertible prime found in the first ten thousand invertible digits (in order of their occurrence) in decimal expansion of π. [Bajpai]

+ 6!+6!+6!+1! = 2161 (which is prime) = 6*6*6*10 + 1, another beastly expression. [Worrom]

+ The hypotenuse of a right triangle with legs of 1620 and 6461. [Gaydos]

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