64944625536 has 96 divisors (see below), whose sum is σ = 213582798000. Its totient is φ = 18555604992.

The previous prime is 64944625517. The next prime is 64944625561. The reversal of 64944625536 is 63552644946.

64944625536 is a `hidden beast` number, since 6 + 4 + 9 + 4 + 4 + 625 + 5 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×64944625536² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4018761 + ... + 4034888.

Almost surely, 2^64944625536 is an apocalyptic number.

It is an amenable number.

64944625536 is an abundant number, since it is smaller than the sum of its proper divisors (148638172464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64944625536 is a wasteful number, since it uses less digits than its factorization.

64944625536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8053676 (or 8053661 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 54.

The spelling of 64944625536 in words is "sixty-four billion, nine hundred forty-four million, six hundred twenty-five thousand, five hundred thirty-six".