20675...18767 (29-digits)

This number is a prime.

                                             206754447 3336073872 1748118767

The Largest non-titanic prime, that is the product of a repunit number and all its truncations minus four, i.e., 11111111*1111111*111111*11111*1111*111*11*1 – 4 [Gupta]