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To the 9th Class student of bvrsss, the number you gave is a Mersenne prime. It may be the largest Mersenne known up to the date you found it, but that is not true now, they find a new larger one at the rate of about once a year, it is now above 2 raised to the (77,232,917) 1. There can never be a largest prime. Euclid proved that. You can use the GIMPS algorithm (The Great Internet Mersenne Prime Search algorithm to find a new Mersenne prime, if you are so inclined. The 50th one was found in 2017 by Jonathan Pace using GIMPS day and night fo fourteen years.