166331173 has 4 divisors (see below), whose sum is σ = 167057740. Its totient is φ = 165604608.

The previous prime is 166331161. The next prime is 166331227. The reversal of 166331173 is 371133661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82846404 + 83484769 = 9102^2 + 9137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166331173 is a prime.

It is a super-2 number, since 2×166331173² = 55332118223111858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166331573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362940 + ... + 363397.

It is an arithmetic number, because the mean of its divisors is an integer number (41764435).

Almost surely, 2^166331173 is an apocalyptic number.

It is an amenable number.

166331173 is a deficient number, since it is larger than the sum of its proper divisors (726567).

166331173 is an equidigital number, since it uses as much as digits as its factorization.

166331173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726566.

The product of its digits is 6804, while the sum is 31.

The square root of 166331173 is about 12896.9443280182. The cubic root of 166331173 is about 549.9517015439.

The spelling of 166331173 in words is "one hundred sixty-six million, three hundred thirty-one thousand, one hundred seventy-three".