Answer
$2^{57,885,161} - 1$ is the largest prime number currently known.
Work Step by Step
The number was discovered through the Great Internet Mersenne Prime Search, where volunteers use software to search for large prime numbers.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.