65

This number is a composite.

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The first 65 digits of 65⁶⁵ form a prime number. [Honaker]

65 = 5 * 13 and π(65) = π(5) * π(13) = 5 + 13. [Honaker]

The reversal of 65^56 is prime. You can copy and paste RevDigits(65^RevDigits(65,10),10) into the 'Value space' at Alpertron (integer factorization calculator) then click on the 'Prime box' to display this 102-digit number. Can you find a larger prime of this form? [Honaker]