646599863600 has 240 divisors, whose sum is σ = 1594183680000. Its totient is φ = 251973196800.

The previous prime is 646599863587. The next prime is 646599863603. The reversal of 646599863600 is 6368995646.

It is not an unprimeable number, because it can be changed into a prime (646599863603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 899304041 + ... + 899304759.

It is an arithmetic number, because the mean of its divisors is an integer number (6642432000).

Almost surely, 2^646599863600 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646599863600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797091840000).

646599863600 is an abundant number, since it is smaller than the sum of its proper divisors (947583816400).

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

646599863600 is a wasteful number, since it uses less digits than its factorization.

646599863600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1145 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 62.

The spelling of 646599863600 in words is "six hundred forty-six billion, five hundred ninety-nine million, eight hundred sixty-three thousand, six hundred".