19370...57287 (2506-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

A Fermat and Lucas PRP consisting of the three numbers 193707721, 2^8233, and 761838257287, separated by three zeros. Note that the first and third numbers are the factors of 2^67-1, which were found by F. N. Cole in 1903. [Earls]