664841363264 has 28 divisors (see below), whose sum is σ = 1420778780484. Its totient is φ = 306849859584.

The previous prime is 664841363237. The next prime is 664841363299. The reversal of 664841363264 is 462363148466.

It can be written as a sum of positive squares in 2 ways, for example, as 416231425600 + 248609937664 = 645160^2 + 498608^2 .

It is a congruent number.

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, 399543257 + ... + 399544920.

It is an arithmetic number, because the mean of its divisors is an integer number (50742099303).

Almost surely, 2^664841363264 is an apocalyptic number.

664841363264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664841363264 is an abundant number, since it is smaller than the sum of its proper divisors (755937417220).

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

664841363264 is a wasteful number, since it uses less digits than its factorization.

664841363264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799088202 (or 799088192 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 53.

The spelling of 664841363264 in words is "six hundred sixty-four billion, eight hundred forty-one million, three hundred sixty-three thousand, two hundred sixty-four".