646812673872 has 40 divisors (see below), whose sum is σ = 1678425740544. Its totient is φ = 214637385984.

The previous prime is 646812673861. The next prime is 646812673889. The reversal of 646812673872 is 278376218646.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30202893 + ... + 30224300.

Almost surely, 2^646812673872 is an apocalyptic number.

It is an amenable number.

646812673872 is an abundant number, since it is smaller than the sum of its proper divisors (1031613066672).

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

646812673872 is a wasteful number, since it uses less digits than its factorization.

646812673872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60427427 (or 60427421 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 60.

The spelling of 646812673872 in words is "six hundred forty-six billion, eight hundred twelve million, six hundred seventy-three thousand, eight hundred seventy-two".