646040520567 has 12 divisors (see below), whose sum is σ = 1004951921064. Its totient is φ = 397563397200.

The previous prime is 646040520527. The next prime is 646040520581. The reversal of 646040520567 is 765025040646.

646040520567 is a `hidden beast` number, since 6 + 4 + 60 + 4 + 0 + 5 + 20 + 567 = 666.

It is not a de Polignac number, because 646040520567 - 2²⁸ = 645772085111 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646040520527) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2760856809 + ... + 2760857042.

It is an arithmetic number, because the mean of its divisors is an integer number (83745993422).

Almost surely, 2^646040520567 is an apocalyptic number.

646040520567 is a deficient number, since it is larger than the sum of its proper divisors (358911400497).

646040520567 is a wasteful number, since it uses less digits than its factorization.

646040520567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5521713870 (or 5521713867 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 646040520567 in words is "six hundred forty-six billion, forty million, five hundred twenty thousand, five hundred sixty-seven".