There's a prime number with 24,962 digits
The largest known prime number as of 2018 is M77232917 × 2^77232917 + 1, a 24,962-digit number discovered by a team of mathematicians using a distributed computing project called GIMPS (Great Internet Mersenne Prime Search). This number is a Mersenne prime, a type of prime number that can be written in the form 2^p - 1, where p is also a prime number. The discovery was announced on January 3, 2018, and verified by multiple mathematicians and computer scientists.