66457...19489 (29-digits)

This number is a prime.

                                             664571998 4454553545 3798119489

J. K. Andersen discovered a large example of two zeroless prime factors whose product has plenty: 66457199844545535453798119489 * 75236392921998416666319329863 = 5000000000000000000000000000000000000000000000000080000007. [Rivera]