664838811264 has 32 divisors (see below), whose sum is σ = 1765978093440. Its totient is φ = 221612936960.

The previous prime is 664838811253. The next prime is 664838811271. The reversal of 664838811264 is 462118838466.

664838811264 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 (32).

It is a super-2 number, since 2×664838811264² (a number of 24 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865675152 + ... + 865675919.

It is an arithmetic number, because the mean of its divisors is an integer number (55186815420).

Almost surely, 2^664838811264 is an apocalyptic number.

664838811264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664838811264 is an abundant number, since it is smaller than the sum of its proper divisors (1101139282176).

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

664838811264 is a wasteful number, since it uses less digits than its factorization.

664838811264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731351088 (or 1731351076 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 57.

The spelling of 664838811264 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, eight hundred eleven thousand, two hundred sixty-four".