64870751664 has 80 divisors (see below), whose sum is σ = 186766042240. Its totient is φ = 21558208320.

The previous prime is 64870751663. The next prime is 64870751821. The reversal of 64870751664 is 46615707846.

64870751664 is a `hidden beast` number, since 64 + 8 + 7 + 0 + 7 + 516 + 64 = 666.

64870751664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 64870751664.

It is not an unprimeable number, because it can be changed into a prime (64870751663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83842 + ... + 369825.

It is an arithmetic number, because the mean of its divisors is an integer number (2334575528).

Almost surely, 2^64870751664 is an apocalyptic number.

It is an amenable number.

64870751664 is an abundant number, since it is smaller than the sum of its proper divisors (121895290576).

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

64870751664 is a wasteful number, since it uses less digits than its factorization.

64870751664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454015 (or 454003 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 64870751664 in words is "sixty-four billion, eight hundred seventy million, seven hundred fifty-one thousand, six hundred sixty-four".