564812125637491 has 2 divisors, whose sum is σ = 564812125637492. Its totient is φ = 564812125637490.

The previous prime is 564812125637477. The next prime is 564812125637581. The reversal of 564812125637491 is 194736521218465.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 564812125637491 - 2²¹ = 564812123540339 is a prime.

It is not a weakly prime, because it can be changed into another prime (564812125607491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282406062818745 + 282406062818746.

It is an arithmetic number, because the mean of its divisors is an integer number (282406062818746).

Almost surely, 2^{564812125637491} is an apocalyptic number.

564812125637491 is a deficient number, since it is larger than the sum of its proper divisors (1).

564812125637491 is an equidigital number, since it uses as much as digits as its factorization.

564812125637491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87091200, while the sum is 64.

The spelling of 564812125637491 in words is "five hundred sixty-four trillion, eight hundred twelve billion, one hundred twenty-five million, six hundred thirty-seven thousand, four hundred ninety-one".