8556572661 has 32 divisors (see below), whose sum is σ = 14046670848. Its totient is φ = 4511712960.

The previous prime is 8556572657. The next prime is 8556572669. The reversal of 8556572661 is 1662756558.

It is a happy number.

It is not a de Polignac number, because 8556572661 - 2² = 8556572657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8556572669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1249930 + ... + 1256756.

It is an arithmetic number, because the mean of its divisors is an integer number (438958464).

Almost surely, 2^8556572661 is an apocalyptic number.

It is an amenable number.

8556572661 is a deficient number, since it is larger than the sum of its proper divisors (5490098187).

8556572661 is a wasteful number, since it uses less digits than its factorization.

8556572661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11441.

The product of its digits is 3024000, while the sum is 51.

The square root of 8556572661 is about 92501.7440970709. The cubic root of 8556572661 is about 2045.3451920164.

The spelling of 8556572661 in words is "eight billion, five hundred fifty-six million, five hundred seventy-two thousand, six hundred sixty-one".