64568368620391 has 2 divisors, whose sum is σ = 64568368620392. Its totient is φ = 64568368620390.

The previous prime is 64568368620373. The next prime is 64568368620403. The reversal of 64568368620391 is 19302686386546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64568368620391 - 2²⁵ = 64568335065959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64568368620361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32284184310195 + 32284184310196.

It is an arithmetic number, because the mean of its divisors is an integer number (32284184310196).

Almost surely, 2^{64568368620391} is an apocalyptic number.

64568368620391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64568368620391 is an equidigital number, since it uses as much as digits as its factorization.

64568368620391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 268738560, while the sum is 67.

The spelling of 64568368620391 in words is "sixty-four trillion, five hundred sixty-eight billion, three hundred sixty-eight million, six hundred twenty thousand, three hundred ninety-one".