Computer finds record-setting prime number that’s over 22 million digits long

Math was my weakest subject in school, but I still find numbers and the processes to discover new ones wonderfully fascinating.

Case in point: a computer has found the largest known prime number ever – two to the 74,207,281 power minus one. The number, called M74207281, is 22,338,618 digits long, racking up almost 5 million more digits than the previous record.

To put that into even greater perspective, if you were to print M74207281 out on paper, using millimeter-size type, the resulting sheath would be about 22km in length.

Prime time

If, like me, integers hurt your head, you may need a reminder that a prime number is a number larger than one that can only be divided by itself and one. Those on the hunt for these massive primes typically multiple by many twos then subtract by one.

The new mega prime is too big to be of practical value, but the search for primes like this is key to putting computer hardware to the test. Software developed by the group that’s searching for these rare primes discovered a flaw in Intel’s Skylate CPUs as well as hardware issues in members of the public’s PCs, according to

And while a computer did the heavy computational lifting, humans were still needed to eliminate non-prime numbers from the pile (thanks for throwing us a bone).

Check out the video below to learn more about the new record-holding prime:

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