The largest known Sophie Germain prime is equal to 2,618,163,402,417 × 21,290,000 − 1, which is 388,342 digits long; it has been discovered in February 2016.[1][2]

Top 10 largest known Sophie Germain primes

Rank Prime Digits Year discovered
1 2,618,163,402,417 × 21,290,000 − 1 388,342 2016
2 18,543,637,900,515 × 2666,667 − 1 200,701 2012

Sources

See also

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