165475989 has 36 divisors (see below), whose sum is σ = 280821216. Its totient is φ = 93613968.

The previous prime is 165475987. The next prime is 165475991. The reversal of 165475989 is 989574561.

165475989 is a `hidden beast` number, since 1 + 6 + 5 + 47 + 598 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (165475987) and next prime (165475991).

It is not a de Polignac number, because 165475989 - 2¹ = 165475987 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165475987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43602 + ... + 47244.

Almost surely, 2^165475989 is an apocalyptic number.

It is an amenable number.

165475989 is a deficient number, since it is larger than the sum of its proper divisors (115345227).

165475989 is a wasteful number, since it uses less digits than its factorization.

165475989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3766 (or 3756 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 165475989 is about 12863.7470824018. The cubic root of 165475989 is about 549.0075645687.

It can be divided in two parts, 165475 and 989, that added together give a square (166464 = 408²).

The spelling of 165475989 in words is "one hundred sixty-five million, four hundred seventy-five thousand, nine hundred eighty-nine".