This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).
The largest prime found in the first 509 digits of e after reordering all 509 digits in a non-descending way. The difference between 509- and 458-digits are due to the 51 zeros existing in these 509 digits of e that would be at the very beginning and therefore do not appear. No larger prime like this is found in the first 1000 digits of prime. [Rivera]