646636464804 has 48 divisors (see below), whose sum is σ = 1646403768576. Its totient is φ = 195900439200.

The previous prime is 646636464787. The next prime is 646636464827. The reversal of 646636464804 is 408464636646.

It is a super-2 number, since 2×646636464804² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104202 + ... + 1141985.

It is an arithmetic number, because the mean of its divisors is an integer number (34300078512).

Almost surely, 2^646636464804 is an apocalyptic number.

It is an amenable number.

646636464804 is an abundant number, since it is smaller than the sum of its proper divisors (999767303772).

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

646636464804 is a wasteful number, since it uses less digits than its factorization.

646636464804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250136 (or 1250134 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 57.

The spelling of 646636464804 in words is "six hundred forty-six billion, six hundred thirty-six million, four hundred sixty-four thousand, eight hundred four".