165663189 has 12 divisors (see below), whose sum is σ = 239448300. Its totient is φ = 110369664.

The previous prime is 165663187. The next prime is 165663191. The reversal of 165663189 is 981366561.

165663189 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 631 + 8 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (165663187) and next prime (165663191).

It can be written as a sum of positive squares in 2 ways, for example, as 152399025 + 13264164 = 12345^2 + 3642^2 .

It is not a de Polignac number, because 165663189 - 2¹ = 165663187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165663187) 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, 10957 + ... + 21245.

It is an arithmetic number, because the mean of its divisors is an integer number (19954025).

Almost surely, 2^165663189 is an apocalyptic number.

It is an amenable number.

165663189 is a deficient number, since it is larger than the sum of its proper divisors (73785111).

165663189 is a wasteful number, since it uses less digits than its factorization.

165663189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12084 (or 12081 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 165663189 is about 12871.0212881496. The cubic root of 165663189 is about 549.2145139989.

The spelling of 165663189 in words is "one hundred sixty-five million, six hundred sixty-three thousand, one hundred eighty-nine".