64645979760 has 120 divisors (see below), whose sum is σ = 220661960064. Its totient is φ = 16956311040.

The previous prime is 64645979731. The next prime is 64645979777. The reversal of 64645979760 is 6797954646.

64645979760 is a `hidden beast` number, since 6 + 46 + 459 + 79 + 76 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 692032 + ... + 779871.

Almost surely, 2^64645979760 is an apocalyptic number.

64645979760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64645979760 is an abundant number, since it is smaller than the sum of its proper divisors (156015980304).

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

64645979760 is a wasteful number, since it uses less digits than its factorization.

64645979760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471983 (or 1471974 counting only the distinct ones).

The product of its (nonzero) digits is 68584320, while the sum is 63.

The spelling of 64645979760 in words is "sixty-four billion, six hundred forty-five million, nine hundred seventy-nine thousand, seven hundred sixty".