646766738694 has 12 divisors (see below), whose sum is σ = 1401327933876. Its totient is φ = 215588912892.

The previous prime is 646766738663. The next prime is 646766738713. The reversal of 646766738694 is 496837667646.

It is a happy number.

646766738694 is a `hidden beast` number, since 6 + 467 + 6 + 6 + 73 + 8 + 6 + 94 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17965742724 + ... + 17965742759.

It is an arithmetic number, because the mean of its divisors is an integer number (116777327823).

Almost surely, 2^646766738694 is an apocalyptic number.

646766738694 is an abundant number, since it is smaller than the sum of its proper divisors (754561195182).

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

646766738694 is a wasteful number, since it uses less digits than its factorization.

646766738694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35931485491 (or 35931485488 counting only the distinct ones).

The product of its digits is 1316818944, while the sum is 72.

The spelling of 646766738694 in words is "six hundred forty-six billion, seven hundred sixty-six million, seven hundred thirty-eight thousand, six hundred ninety-four".