165342509 has 8 divisors (see below), whose sum is σ = 168279480. Its totient is φ = 162429696.

The previous prime is 165342481. The next prime is 165342517. The reversal of 165342509 is 905243561.

It can be written as a sum of positive squares in 4 ways, for example, as 24255625 + 141086884 = 4925^2 + 11878^2 .

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-165342509 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 (165342559) 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 7 ways as a sum of consecutive naturals, for example, 8057 + ... + 19889.

It is an arithmetic number, because the mean of its divisors is an integer number (21034935).

Almost surely, 2^165342509 is an apocalyptic number.

It is an amenable number.

165342509 is a deficient number, since it is larger than the sum of its proper divisors (2936971).

165342509 is a wasteful number, since it uses less digits than its factorization.

165342509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12079.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 165342509 is about 12858.5578118232. The cubic root of 165342509 is about 548.8599072097.

The spelling of 165342509 in words is "one hundred sixty-five million, three hundred forty-two thousand, five hundred nine".