646056365505 has 16 divisors (see below), whose sum is σ = 1034098657344. Its totient is φ = 344427237440.

The previous prime is 646056365501. The next prime is 646056365509. The reversal of 646056365505 is 505563650646.

It is an interprime number because it is at equal distance from previous prime (646056365501) and next prime (646056365509).

It is not a de Polignac number, because 646056365505 - 2² = 646056365501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646056365501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8470614 + ... + 8546543.

It is an arithmetic number, because the mean of its divisors is an integer number (64631166084).

Almost surely, 2^646056365505 is an apocalyptic number.

It is an amenable number.

646056365505 is a deficient number, since it is larger than the sum of its proper divisors (388042291839).

646056365505 is a wasteful number, since it uses less digits than its factorization.

646056365505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17019696.

The product of its (nonzero) digits is 9720000, while the sum is 51.

The spelling of 646056365505 in words is "six hundred forty-six billion, fifty-six million, three hundred sixty-five thousand, five hundred five".