166137173 has 4 divisors (see below), whose sum is σ = 166368960. Its totient is φ = 165905388.

The previous prime is 166137157. The next prime is 166137187. The reversal of 166137173 is 371731661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166137173 - 2⁴ = 166137157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166137113) 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, 114815 + ... + 116252.

It is an arithmetic number, because the mean of its divisors is an integer number (41592240).

Almost surely, 2^166137173 is an apocalyptic number.

It is an amenable number.

166137173 is a deficient number, since it is larger than the sum of its proper divisors (231787).

166137173 is an equidigital number, since it uses as much as digits as its factorization.

166137173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231786.

The product of its digits is 15876, while the sum is 35.

The square root of 166137173 is about 12889.4209722547. The cubic root of 166137173 is about 549.7378067088.

The spelling of 166137173 in words is "one hundred sixty-six million, one hundred thirty-seven thousand, one hundred seventy-three".