646579932144 has 80 divisors (see below), whose sum is σ = 1716513207552. Its totient is φ = 209610745344.

The previous prime is 646579932139. The next prime is 646579932191. The reversal of 646579932144 is 441239975646.

646579932144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 191332 + ... + 1153155.

Almost surely, 2^646579932144 is an apocalyptic number.

It is an amenable number.

646579932144 is an abundant number, since it is smaller than the sum of its proper divisors (1069933275408).

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

646579932144 is a wasteful number, since it uses less digits than its factorization.

646579932144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344774 (or 1344768 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 60.

The spelling of 646579932144 in words is "six hundred forty-six billion, five hundred seventy-nine million, nine hundred thirty-two thousand, one hundred forty-four".