Largest known prime number

The largest known prime number is the biggest known integer which is a prime number. To date, it equals 282,589,933 − 1, it would take 24,862,048 digits to write that entire number out. The number was found on December 21, 2018.
History.
This table lists every number that was once the largest known prime number. The first known record was from 1456. The number 524,287 was the largest known prime number for 144 years.
"Mn" is short for 2"n" − 1, the Mersenne number with exponent "n".