165353909 has 8 divisors (see below), whose sum is σ = 190228608. Its totient is φ = 140792400.

The previous prime is 165353897. The next prime is 165353921. The reversal of 165353909 is 909353561.

It is an interprime number because it is at equal distance from previous prime (165353897) and next prime (165353921).

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

It is a de Polignac number, because none of the positive numbers 2^k-165353909 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 (165353939) 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, 77162 + ... + 79275.

It is an arithmetic number, because the mean of its divisors is an integer number (23778576).

Almost surely, 2^165353909 is an apocalyptic number.

It is an amenable number.

165353909 is a deficient number, since it is larger than the sum of its proper divisors (24874699).

165353909 is a wasteful number, since it uses less digits than its factorization.

165353909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156595.

The product of its (nonzero) digits is 109350, while the sum is 41.

The square root of 165353909 is about 12859.0010887316. The cubic root of 165353909 is about 548.8725211450.

The spelling of 165353909 in words is "one hundred sixty-five million, three hundred fifty-three thousand, nine hundred nine".