166218125 has 40 divisors (see below), whose sum is σ = 224328192. Its totient is φ = 122760000.

The previous prime is 166218119. The next prime is 166218149. The reversal of 166218125 is 521812661.

It is not a de Polignac number, because 166218125 - 2⁸ = 166217869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166218091 and 166218100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 445439 + ... + 445811.

Almost surely, 2^166218125 is an apocalyptic number.

It is an amenable number.

166218125 is a deficient number, since it is larger than the sum of its proper divisors (58110067).

166218125 is an equidigital number, since it uses as much as digits as its factorization.

166218125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 432 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 166218125 is about 12892.5608394919. The cubic root of 166218125 is about 549.8270806263.

The spelling of 166218125 in words is "one hundred sixty-six million, two hundred eighteen thousand, one hundred twenty-five".