43570...91581 (104-digits)

This number is a prime.

                                       4357 0062353753 4460534556 1005667974
0005056966 1118420894 0783890278 3209959981 5930778113 3050732832 7968191581

The first prime number greater than a googol which is a repunit in duodecimal form (97 ones). [Barnes]