166518189 has 12 divisors (see below), whose sum is σ = 240639100. Its totient is φ = 110960064.

The previous prime is 166518181. The next prime is 166518197. The reversal of 166518189 is 981815661.

It is an interprime number because it is at equal distance from previous prime (166518181) and next prime (166518197).

It can be written as a sum of positive squares in 2 ways, for example, as 155825289 + 10692900 = 12483^2 + 3270^2 .

It is not a de Polignac number, because 166518189 - 2³ = 166518181 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 (166518181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31467 + ... + 36375.

Almost surely, 2^166518189 is an apocalyptic number.

It is an amenable number.

166518189 is a deficient number, since it is larger than the sum of its proper divisors (74120911).

166518189 is a wasteful number, since it uses less digits than its factorization.

166518189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8684 (or 8681 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 166518189 is about 12904.1926907498. The cubic root of 166518189 is about 550.1577387786.

The spelling of 166518189 in words is "one hundred sixty-six million, five hundred eighteen thousand, one hundred eighty-nine".