644446112568200 has 48 divisors (see below), whose sum is σ = 1498338894118500. Its totient is φ = 257778155582720.

The previous prime is 644446112568173. The next prime is 644446112568229. The reversal of 644446112568200 is 2865211644446.

644446112568200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 244388750511844 + 400057362056356 = 15632938^2 + 20001434^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 315909086 + ... + 317942514.

Almost surely, 2^{644446112568200} is an apocalyptic number.

It is an amenable number.

644446112568200 is an abundant number, since it is smaller than the sum of its proper divisors (853892781550300).

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

644446112568200 is a wasteful number, since it uses less digits than its factorization.

644446112568200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618074 (or 3618065 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 53.

The spelling of 644446112568200 in words is "six hundred forty-four trillion, four hundred forty-six billion, one hundred twelve million, five hundred sixty-eight thousand, two hundred".