56067...15433 (106-digits)

This number is a prime.

                                     560671 1279381880 7759090640 3103377727
6169702233 1786998848 3399360167 2446267509 6723055115 8901851145 4217415433

The product of the first 19 Mersenne exponents plus the product of the next 20 known exponents (as of September 2002) is prime. [Rupinski]