64644932607 has 4 divisors (see below), whose sum is σ = 86193243480. Its totient is φ = 43096621736.

The previous prime is 64644932563. The next prime is 64644932629. The reversal of 64644932607 is 70623944646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64644932607 - 2¹⁶ = 64644867071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64644932607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644932507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10774155432 + ... + 10774155437.

It is an arithmetic number, because the mean of its divisors is an integer number (21548310870).

Almost surely, 2^64644932607 is an apocalyptic number.

64644932607 is a deficient number, since it is larger than the sum of its proper divisors (21548310873).

64644932607 is a wasteful number, since it uses less digits than its factorization.

64644932607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21548310872.

The product of its (nonzero) digits is 5225472, while the sum is 51.

The spelling of 64644932607 in words is "sixty-four billion, six hundred forty-four million, nine hundred thirty-two thousand, six hundred seven".