46

This number is a composite.

The 46th prime is 199. Let C = the number of combinations of a group of 199 objects taken 46 at a time. Note that 199!/[46!(199-46)!] has 46 digits and C ± 1 are both primes! [Hartley]

The least even number 2k such that SOP(2, P(k)) is divisible by 2k, i.e., SOP(2, P(k)) is congruent to 0 mod (2k). Note that SOP(2, P(k)) = the sum of primes from 2 to the prime P(k). [Rivera]

46 is the smallest base b for which (b^67-1)/(b-1) is prime.