165440009 has 8 divisors (see below), whose sum is σ = 190035648. Its totient is φ = 141084720.

The previous prime is 165439933. The next prime is 165440027. The reversal of 165440009 is 900044561.

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-165440009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165440609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58607 + ... + 61364.

It is an arithmetic number, because the mean of its divisors is an integer number (23754456).

Almost surely, 2^165440009 is an apocalyptic number.

It is an amenable number.

165440009 is a deficient number, since it is larger than the sum of its proper divisors (24595639).

165440009 is a wasteful number, since it uses less digits than its factorization.

165440009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120175.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 165440009 is about 12862.3485025092. The cubic root of 165440009 is about 548.9677708316.

The spelling of 165440009 in words is "one hundred sixty-five million, four hundred forty thousand, nine".