166999979758784 has 28 divisors (see below), whose sum is σ = 331392306970728. Its totient is φ = 83499555955200.

The previous prime is 166999979758757. The next prime is 166999979758837. The reversal of 166999979758784 is 487857979999661.

It is a super-3 number, since 3×166999979758784³ (a number of 44 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 5812979 + ... + 19177869.

Almost surely, 2^{166999979758784} is an apocalyptic number.

It is an amenable number.

166999979758784 is a deficient number, since it is larger than the sum of its proper divisors (164392327211944).

166999979758784 is a wasteful number, since it uses less digits than its factorization.

166999979758784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13560144 (or 13560134 counting only the distinct ones).

The product of its digits is 933295426560, while the sum is 104.

The spelling of 166999979758784 in words is "one hundred sixty-six trillion, nine hundred ninety-nine billion, nine hundred seventy-nine million, seven hundred fifty-eight thousand, seven hundred eighty-four".