6564646556 has 12 divisors (see below), whose sum is σ = 12371833992. Its totient is φ = 3029836848.

The previous prime is 6564646447. The next prime is 6564646579. The reversal of 6564646556 is 6556464656.

It is a super-2 number, since 2×6564646556² = 86189168810405322272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6564646498 and 6564646507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63121550 + ... + 63121653.

It is an arithmetic number, because the mean of its divisors is an integer number (1030986166).

Almost surely, 2^6564646556 is an apocalyptic number.

It is an amenable number.

6564646556 is a deficient number, since it is larger than the sum of its proper divisors (5807187436).

6564646556 is a wasteful number, since it uses less digits than its factorization.

6564646556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126243220 (or 126243218 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 53.

The square root of 6564646556 is about 81022.5064781385. The cubic root of 6564646556 is about 1872.4222051419.

The spelling of 6564646556 in words is "six billion, five hundred sixty-four million, six hundred forty-six thousand, five hundred fifty-six".