It is 2^82589933 - 1 and like all recent records was found by the Great Internet Mersenne Prime Search. https://www.mersenne.org/primes/?press=M82589933&fbclid=IwAR3haR61VUzJTflMj2WX2re6J4YMsRkqPIpKSqUwY98cjvrgfyKsbegcxdM

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