99999...72357 (100-digits)

This number is a prime.

                                            9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999872357

The largest prime less than a googol containing substring of all the prime digits in order (2357). [Bajpai]