644795979592 has 32 divisors (see below), whose sum is σ = 1214327635200. Its totient is φ = 320975893504.

The previous prime is 644795979563. The next prime is 644795979613. The reversal of 644795979592 is 295979597446.

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, 8898693 + ... + 8970859.

It is an arithmetic number, because the mean of its divisors is an integer number (37947738600).

Almost surely, 2^644795979592 is an apocalyptic number.

It is an amenable number.

644795979592 is a deficient number, since it is larger than the sum of its proper divisors (569531655608).

644795979592 is a wasteful number, since it uses less digits than its factorization.

644795979592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77085 (or 77081 counting only the distinct ones).

The product of its digits is 1543147200, while the sum is 76.

The spelling of 644795979592 in words is "six hundred forty-four billion, seven hundred ninety-five million, nine hundred seventy-nine thousand, five hundred ninety-two".