4423

This number is a prime.

When read in base 26 with a=0, b=1, c=2, ..., z=25, then "God" is prime. [Luen]

The first titanic Mersenne prime to be discovered was 2^4423-1.

7!-6!+5!-4!+3!+2!-1! is prime. Note that the prime numbers are positive and otherwise are negative. [Marcel]