Largest Known Prime Number Discovered. (Article)

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Article here. A math professor has discovered a prime number whose digits number 17,425,170. That is seventeen-million-four hundred-twenty five-thousand-one hundred-seventy digits long. This dethrones the previous record of a prime number that is ~12 million. The number in question is 2^57,885,161-1.

From the article " the number is the 48th example of a rare class of primes called
Mersenne Primes. Mersenne primes take the form of 2 raised to the power
of a prime number minus 1. Since they were first described by French
monk Marin Mersenne 350 years ago, only 48 of these elusive numbers have
been found, including the most recent discovery."