Largest known prime number (as of early 2018). The number, which has over 23 million digits, is arrived at by calculating two to the power of 77,232,9

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Largest known prime number (as of early 2018). The number, which has over 23 million digits, is arrived at by calculating two to the power of 77,232,917 and subtracting one. A prime number is a whole number greater than one that can only be divided evenly by one and itself.

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