26525...99999 (33-digits)

This number is a prime.

                                        265 2528598121 9105863630 8479999999

265252859812191058636308479999999 is a factorial-minus-one prime (30! - 1). [Dobb]

((5#)!)-1 is prime. 5 is the largest known prime such that this is true. [Patterson]