10000...95327 (26-digits)

This number is a prime.

                                                100000 0000000000 0127995327

This prime is such that 127996333 + 10^25 is again a prime, which happens to be the upper bound of the first gap larger than 999 between primes > 10^25. (The gap is of size 1006 and starts after prime 10^25 + 127995327.) [Hasler]