3223261961

This number is a prime.

Nine primes are obtained by progressively intertwining the digit 6 into the prime 3223261961, i.e., 362623261961, 3626263261961, 36262636261961, 362626362661961, 3626263626661961, 36262636266616961, 362626362666169661, 3626263626661696661. [Rivera]