99999...95023 (101-digits)

This number is a prime.

                                          9 9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999995023

10^101-4977 is the largest 101-digit prime whose sum of digits equals the prime 883. [Bajpai]