646020455664 has 40 divisors (see below), whose sum is σ = 1684483257600. Its totient is φ = 213327625408.

The previous prime is 646020455611. The next prime is 646020455681. The reversal of 646020455664 is 466554020646.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 62886264 + ... + 62896535.

It is an arithmetic number, because the mean of its divisors is an integer number (42112081440).

Almost surely, 2^646020455664 is an apocalyptic number.

It is an amenable number.

646020455664 is an abundant number, since it is smaller than the sum of its proper divisors (1038462801936).

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

646020455664 is a wasteful number, since it uses less digits than its factorization.

646020455664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125782917 (or 125782911 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 646020455664 in words is "six hundred forty-six billion, twenty million, four hundred fifty-five thousand, six hundred sixty-four".