646563100560 has 80 divisors (see below), whose sum is σ = 2158526053824. Its totient is φ = 159153993216.

The previous prime is 646563100531. The next prime is 646563100627. The reversal of 646563100560 is 65001365646.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 103612762 + ... + 103619001.

Almost surely, 2^646563100560 is an apocalyptic number.

646563100560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646563100560 is an abundant number, since it is smaller than the sum of its proper divisors (1511962953264).

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

646563100560 is a wasteful number, since it uses less digits than its factorization.

646563100560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207231792 (or 207231786 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 646563100560 in words is "six hundred forty-six billion, five hundred sixty-three million, one hundred thousand, five hundred sixty".