95861...78973 (39-digits)

This number is a prime.

                                  958619577 8359471439 3831931415 1899378973

Just showing those entries submitted by 'Honaker': (Click here to show all)

Omit the rightmost digit from the prime 958619577835947143938319314151899378973 and the remaining number is the largest right-truncatable semiprime. [Gupta and Honaker]