23511...36263 (502-digits)

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

The largest non- titanic prime formed from the concatenation of the first n Sophie Germain primes, i.e., {2, 3, 5, 11, ...., 6131, 6173, 6263}, (case n=138). [Gupta]