666616856100 has 72 divisors (see below), whose sum is σ = 2077109764800. Its totient is φ = 164090302080.

The previous prime is 666616856083. The next prime is 666616856111. The reversal of 666616856100 is 1658616666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 85459800 + ... + 85467599.

Almost surely, 2^666616856100 is an apocalyptic number.

666616856100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666616856100 is an abundant number, since it is smaller than the sum of its proper divisors (1410492908700).

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

666616856100 is a wasteful number, since it uses less digits than its factorization.

666616856100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170927429 (or 170927422 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 666616856100 in words is "six hundred sixty-six billion, six hundred sixteen million, eight hundred fifty-six thousand, one hundred".