10100...53279 (633-digits)

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

A right-truncatable prime of order 3, i.e., by removing 3 digits at a time from the right end, you get a sequence of 211 primes. This is the largest known, as of 6 July 2019. [Gupta]