19999...96771 (1000-digits)

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

Just showing those entries submitted by 'Rivera': (Click here to show all)

2*10^999-3229 and 3229 are the greatest apart and symmetric primes from its center 10^999. Thus, the average of both primes is 10^999. [Rivera]