61605403707

This number is a composite.

                                                                6 1605403707

61605403707 is the only integer composed of 11 digits that produces a prime number by inserting orderly prime numbers starting with the prime 2 (except the prime 3), one at a time, in every position. Discovered by Jan van Delden (May 2018): 61605403707 -> {261605403707, 651605403707, 617605403707, 6161105403707, 6160135403707, 6160517403707, 6160541903707, 6160540233707, 6160540329707, 6160540373107, 6160540370377, 6160540370741} [Rivera]