12360...09013 (24-digits)

This number is a prime.

                                                  1236 0600901222 5672009013

123606009012225672009013 is the largest prime containing L digits such that the k leftmost digits are divided by k for k = 1, 2, 3, ... , L-1. Here, L = 24. Found by Jud McCranie, J. C. Colin, and Joe K. Crump. [Rivera]