64845717440 has 56 divisors (see below), whose sum is σ = 176472994272. Its totient is φ = 22232816640.

The previous prime is 64845717421. The next prime is 64845717479. The reversal of 64845717440 is 4471754846.

64845717440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14472251 + ... + 14476730.

Almost surely, 2^64845717440 is an apocalyptic number.

It is an amenable number.

64845717440 is an abundant number, since it is smaller than the sum of its proper divisors (111627276832).

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

64845717440 is a wasteful number, since it uses less digits than its factorization.

64845717440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28949005 (or 28948995 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 50.

The spelling of 64845717440 in words is "sixty-four billion, eight hundred forty-five million, seven hundred seventeen thousand, four hundred forty".