53644320864 has 72 divisors (see below), whose sum is σ = 152605351080. Its totient is φ = 17875074048.

The previous prime is 53644320739. The next prime is 53644320887. The reversal of 53644320864 is 46802344635.

53644320864 is a `hidden beast` number, since 536 + 4 + 4 + 32 + 0 + 86 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 814744 + ... + 878120.

It is an arithmetic number, because the mean of its divisors is an integer number (2119518765).

Almost surely, 2^53644320864 is an apocalyptic number.

It is an amenable number.

53644320864 is an abundant number, since it is smaller than the sum of its proper divisors (98961030216).

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

53644320864 is a wasteful number, since it uses less digits than its factorization.

53644320864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66332 (or 66321 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 45.

The spelling of 53644320864 in words is "fifty-three billion, six hundred forty-four million, three hundred twenty thousand, eight hundred sixty-four".