28589...33003 (4032-digits)

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

The first proven example of a widely digitally delicate prime. It is a prime which can never produce a prime by changing a digit, even if an arbitrarily large number of leading zeroes are added. There are infinite such primes, but none were known until Jon Grantham discovered this prime in 2022. [Gudipati]