166589009 has 16 divisors (see below), whose sum is σ = 179773440. Its totient is φ = 154057680.

The previous prime is 166588999. The next prime is 166589011. The reversal of 166589009 is 900985661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166589009 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166589039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61322 + ... + 63980.

It is an arithmetic number, because the mean of its divisors is an integer number (11235840).

Almost surely, 2^166589009 is an apocalyptic number.

It is an amenable number.

166589009 is a deficient number, since it is larger than the sum of its proper divisors (13184431).

166589009 is a wasteful number, since it uses less digits than its factorization.

166589009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 166589009 is about 12906.9364684266. The cubic root of 166589009 is about 550.2357215485.

The spelling of 166589009 in words is "one hundred sixty-six million, five hundred eighty-nine thousand, nine".