6566556656 has 20 divisors (see below), whose sum is σ = 13879313304. Its totient is φ = 2984798400.

The previous prime is 6566556641. The next prime is 6566556677.

6566556656 is nontrivially palindromic in base 10.

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, 18654815 + ... + 18655166.

Almost surely, 2^6566556656 is an apocalyptic number.

It is an amenable number.

6566556656 is an abundant number, since it is smaller than the sum of its proper divisors (7312756648).

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

6566556656 is a wasteful number, since it uses less digits than its factorization.

6566556656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37310000 (or 37309994 counting only the distinct ones).

The product of its digits is 29160000, while the sum is 56.

The square root of 6566556656 is about 81034.2930863224. The cubic root of 6566556656 is about 1872.6037923148.

The spelling of 6566556656 in words is "six billion, five hundred sixty-six million, five hundred fifty-six thousand, six hundred fifty-six".