166120189 has 4 divisors (see below), whose sum is σ = 166852224. Its totient is φ = 165388156.

The previous prime is 166120177. The next prime is 166120193. The reversal of 166120189 is 981021661.

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 a de Polignac number, because none of the positive numbers 2^k-166120189 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 (166120109) 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, 365677 + ... + 366130.

It is an arithmetic number, because the mean of its divisors is an integer number (41713056).

Almost surely, 2^166120189 is an apocalyptic number.

It is an amenable number.

166120189 is a deficient number, since it is larger than the sum of its proper divisors (732035).

166120189 is an equidigital number, since it uses as much as digits as its factorization.

166120189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732034.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 166120189 is about 12888.7621205452. The cubic root of 166120189 is about 549.7190730625.

The spelling of 166120189 in words is "one hundred sixty-six million, one hundred twenty thousand, one hundred eighty-nine".