64758056923491 has 16 divisors (see below), whose sum is σ = 86749162790400. Its totient is φ = 42969677064608.

The previous prime is 64758056923477. The next prime is 64758056923501. The reversal of 64758056923491 is 19432965085746.

It is a cyclic number.

It is not a de Polignac number, because 64758056923491 - 2²⁹ = 64757520052579 is a prime.

It is a super-2 number, since 2×64758056923491² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64758056923891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21400176 + ... + 24238061.

It is an arithmetic number, because the mean of its divisors is an integer number (5421822674400).

It is a 1-persistent number, because it is pandigital, but 2⋅64758056923491 = 129516113846982 is not.

Almost surely, 2^{64758056923491} is an apocalyptic number.

64758056923491 is a deficient number, since it is larger than the sum of its proper divisors (21991105866909).

64758056923491 is a wasteful number, since it uses less digits than its factorization.

64758056923491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45640458.

The product of its (nonzero) digits is 391910400, while the sum is 69.

The spelling of 64758056923491 in words is "sixty-four trillion, seven hundred fifty-eight billion, fifty-six million, nine hundred twenty-three thousand, four hundred ninety-one".