166999979758785 has 32 divisors (see below), whose sum is σ = 286498848407040. Its totient is φ = 82766333964288.

The previous prime is 166999979758757. The next prime is 166999979758837. The reversal of 166999979758785 is 587857979999661.

166999979758785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166999979758785 - 2¹⁵ = 166999979726017 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4144928472 + ... + 4144968761.

It is an arithmetic number, because the mean of its divisors is an integer number (8953089012720).

Almost surely, 2^{166999979758785} is an apocalyptic number.

166999979758785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166999979758785 is a deficient number, since it is larger than the sum of its proper divisors (119498868648255).

166999979758785 is a wasteful number, since it uses less digits than its factorization.

166999979758785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8289897337.

The product of its digits is 1166619283200, while the sum is 105.

The spelling of 166999979758785 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-five".