25000...00081 (34-digits)

This number is a prime.

                                       2500 0000000000 0000000000 0000000081

When 10^180+180^10, an x^y+y^x number, is typed into Alpertron , a 34-digit factor of 25*10^32+81 appears almost instantaneously. 30 of the 34 digits of this factor are zeros. No, 25*10^32+81 isn't a glitch, and isn't something that you should think of as too easy an answer to be correct. [Stath]