24059...90437 (51-digits)

This number is a prime.

                    2 4059830533 7711814846 0080180074 3362420631 8326190437

The sum of the squares of the factorials of the first 13 positive odd numbers is a prime number, i.e., (1!^2 + 3!^2 + 5!^2 + ... + 23!^2 + 25!^2). The next such prime will have 539 decimal digits. [Bajpai]