166555812975 has 12 divisors (see below), whose sum is σ = 275372277576. Its totient is φ = 88829766880.

The previous prime is 166555812959. The next prime is 166555813009. The reversal of 166555812975 is 579218555661.

It is not a de Polignac number, because 166555812975 - 2⁴ = 166555812959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110372012 + ... + 1110372161.

It is an arithmetic number, because the mean of its divisors is an integer number (22947689798).

Almost surely, 2^166555812975 is an apocalyptic number.

166555812975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166555812975 is a deficient number, since it is larger than the sum of its proper divisors (108816464601).

166555812975 is a wasteful number, since it uses less digits than its factorization.

166555812975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220744186 (or 2220744181 counting only the distinct ones).

The product of its digits is 22680000, while the sum is 60.

The spelling of 166555812975 in words is "one hundred sixty-six billion, five hundred fifty-five million, eight hundred twelve thousand, nine hundred seventy-five".