This number is a prime.

+ One less than the product of the digits of the Mersenne prime exponent for M45 (i.e., 3*7*1*5*6*6*6*7 - 1) is an emirp. (M45 is the largest known Mersenne prime to exhibit this property, M44 being the second largest!). Note also that 158761 is a twin prime. [Harrison]

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