644531202464160 has 192 divisors, whose sum is σ = 2215818042157440. Its totient is φ = 156181243822080.

The previous prime is 644531202464159. The next prime is 644531202464197. The reversal of 644531202464160 is 61464202135446.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14850805 + ... + 38853684.

It is an arithmetic number, because the mean of its divisors is an integer number (11540718969570).

Almost surely, 2^{644531202464160} is an apocalyptic number.

644531202464160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

644531202464160 is an abundant number, since it is smaller than the sum of its proper divisors (1571286839693280).

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

644531202464160 is a wasteful number, since it uses less digits than its factorization.

644531202464160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53706791 (or 53706783 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 48.

The spelling of 644531202464160 in words is "six hundred forty-four trillion, five hundred thirty-one billion, two hundred two million, four hundred sixty-four thousand, one hundred sixty".