165959609 has 8 divisors (see below), whose sum is σ = 167132160. Its totient is φ = 164791456.

The previous prime is 165959569. The next prime is 165959611. The reversal of 165959609 is 906959561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165959609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165959639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110864 + ... + 112350.

It is an arithmetic number, because the mean of its divisors is an integer number (20891520).

Almost surely, 2^165959609 is an apocalyptic number.

It is an amenable number.

165959609 is a deficient number, since it is larger than the sum of its proper divisors (1172551).

165959609 is a wasteful number, since it uses less digits than its factorization.

165959609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199.

The product of its (nonzero) digits is 656100, while the sum is 50.

The square root of 165959609 is about 12882.5311565701. The cubic root of 165959609 is about 549.5418873998.

The spelling of 165959609 in words is "one hundred sixty-five million, nine hundred fifty-nine thousand, six hundred nine".