88888...88889 (35-digits)

This number is a prime.

                                      88888 8888888888 8888888888 8888888889

The largest near-repdigit non-titanic prime p found in the sequence 89, 889, 8889, 88889, 888889, 8888889, etc. Curiously, the sum of digits of p equals the 60th prime (i.e., 281). [Bajpai]