166931385 has 8 divisors (see below), whose sum is σ = 267090240. Its totient is φ = 89030064.

The previous prime is 166931353. The next prime is 166931389. The reversal of 166931385 is 583139661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166931385 - 2⁵ = 166931353 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (166931389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5564365 + ... + 5564394.

It is an arithmetic number, because the mean of its divisors is an integer number (33386280).

Almost surely, 2^166931385 is an apocalyptic number.

166931385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166931385 is a deficient number, since it is larger than the sum of its proper divisors (100158855).

166931385 is a wasteful number, since it uses less digits than its factorization.

166931385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11128767.

The product of its digits is 116640, while the sum is 42.

The square root of 166931385 is about 12920.1929165164. The cubic root of 166931385 is about 550.6124142543.

The spelling of 166931385 in words is "one hundred sixty-six million, nine hundred thirty-one thousand, three hundred eighty-five".