6564606556 has 12 divisors (see below), whose sum is σ = 11492572168. Its totient is φ = 3281014512.

The previous prime is 6564606539. The next prime is 6564606557. The reversal of 6564606556 is 6556064656.

It is a super-2 number, since 2×6564606556² = 86188118470156362272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (49) 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 (6564606557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310686 + ... + 331141.

Almost surely, 2^6564606556 is an apocalyptic number.

It is an amenable number.

6564606556 is a deficient number, since it is larger than the sum of its proper divisors (4927965612).

6564606556 is a wasteful number, since it uses less digits than its factorization.

6564606556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644388 (or 644386 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 49.

The square root of 6564606556 is about 81022.2596327701. The cubic root of 6564606556 is about 1872.4184020918.

The spelling of 6564606556 in words is "six billion, five hundred sixty-four million, six hundred six thousand, five hundred fifty-six".