165415509 has 12 divisors (see below), whose sum is σ = 273066976. Its totient is φ = 94523112.

The previous prime is 165415499. The next prime is 165415529. The reversal of 165415509 is 905514561.

165415509 is a `hidden beast` number, since 1 + 65 + 41 + 550 + 9 = 666.

It is not a de Polignac number, because 165415509 - 2⁷ = 165415381 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165415529) 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 11 ways as a sum of consecutive naturals, for example, 1312759 + ... + 1312884.

Almost surely, 2^165415509 is an apocalyptic number.

It is an amenable number.

165415509 is a deficient number, since it is larger than the sum of its proper divisors (107651467).

165415509 is a wasteful number, since it uses less digits than its factorization.

165415509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625656 (or 2625653 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 165415509 is about 12861.3960750768. The cubic root of 165415509 is about 548.9406706269.

The spelling of 165415509 in words is "one hundred sixty-five million, four hundred fifteen thousand, five hundred nine".