11011...00101 (37-digits)

This number is a prime.

                                    1101111 0001001101 0101111001 1011100101

The smallest concatenate prime comprising all hour numbers of an analogue clock in binary scale in a clockwise sweep (corresponds to the concatenation of base two representations of 6, 7, 8, 9, 10, 11, 12, 1, 2, 3, 4, 5 ). Note the prime number of digits. [Beedassy]