6564156666 has 32 divisors (see below), whose sum is σ = 13283137728. Its totient is φ = 2162361600.

The previous prime is 6564156631. The next prime is 6564156667. The reversal of 6564156666 is 6666514656.

It is not an unprimeable number, because it can be changed into a prime (6564156667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221316 + ... + 249216.

It is an arithmetic number, because the mean of its divisors is an integer number (415098054).

Almost surely, 2^6564156666 is an apocalyptic number.

6564156666 is an abundant number, since it is smaller than the sum of its proper divisors (6718981062).

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

6564156666 is a wasteful number, since it uses less digits than its factorization.

6564156666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28366.

The product of its digits is 4665600, while the sum is 51.

The square root of 6564156666 is about 81019.4832494012. The cubic root of 6564156666 is about 1872.3756271719.

The spelling of 6564156666 in words is "six billion, five hundred sixty-four million, one hundred fifty-six thousand, six hundred sixty-six".