8557940666 has 16 divisors (see below), whose sum is σ = 14015160000. Its totient is φ = 3886846080.

The previous prime is 8557940663. The next prime is 8557940747. The reversal of 8557940666 is 6660497558.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (8557940663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128246 + ... + 183201.

It is an arithmetic number, because the mean of its divisors is an integer number (875947500).

Almost surely, 2^8557940666 is an apocalyptic number.

8557940666 is a deficient number, since it is larger than the sum of its proper divisors (5457219334).

8557940666 is a wasteful number, since it uses less digits than its factorization.

8557940666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312709.

The product of its (nonzero) digits is 10886400, while the sum is 56.

The square root of 8557940666 is about 92509.1382837393. The cubic root of 8557940666 is about 2045.4541878905.

The spelling of 8557940666 in words is "eight billion, five hundred fifty-seven million, nine hundred forty thousand, six hundred sixty-six".