6660505672166 has 32 divisors (see below), whose sum is σ = 10655674848000. Its totient is φ = 3113522127072.

The previous prime is 6660505672129. The next prime is 6660505672181. The reversal of 6660505672166 is 6612765050666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2893301 + ... + 4657488.

It is an arithmetic number, because the mean of its divisors is an integer number (332989839000).

Almost surely, 2^{6660505672166} is an apocalyptic number.

6660505672166 is a deficient number, since it is larger than the sum of its proper divisors (3995169175834).

6660505672166 is a wasteful number, since it uses less digits than its factorization.

6660505672166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7551116.

The product of its (nonzero) digits is 16329600, while the sum is 56.

The spelling of 6660505672166 in words is "six trillion, six hundred sixty billion, five hundred five million, six hundred seventy-two thousand, one hundred sixty-six".