11111...11111 (3010-digits)

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

One of the primes in the first-ever prime motion picture, where each of the 11 frames is made of 3010-digit primes. This video makes use of prime numbers to recreate the first-ever motion picture made in 1878 to study a galloping horse. [Gudipati]