166189 has 2 divisors, whose sum is σ = 166190. Its totient is φ = 166188.

The previous prime is 166183. The next prime is 166207. The reversal of 166189 is 981661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128164 + 38025 = 358^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 166189 - 2⁵ = 166157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83094 + 83095.

It is an arithmetic number, because the mean of its divisors is an integer number (83095).

2¹⁶⁶¹⁸⁹ is an apocalyptic number.

It is an amenable number.

166189 is a deficient number, since it is larger than the sum of its proper divisors (1).

166189 is an equidigital number, since it uses as much as digits as its factorization.

166189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The square root of 166189 is about 407.6628508952. The cubic root of 166189 is about 54.9794964897.

The spelling of 166189 in words is "one hundred sixty-six thousand, one hundred eighty-nine".