165440015 has 12 divisors (see below), whose sum is σ = 214975224. Its totient is φ = 122170464.

The previous prime is 165439933. The next prime is 165440027. The reversal of 165440015 is 510044561.

It is not a de Polignac number, because 165440015 - 2¹⁰ = 165438991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97049 + ... + 98738.

It is an arithmetic number, because the mean of its divisors is an integer number (17914602).

Almost surely, 2^165440015 is an apocalyptic number.

165440015 is a deficient number, since it is larger than the sum of its proper divisors (49535209).

165440015 is a wasteful number, since it uses less digits than its factorization.

165440015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195818 (or 195805 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 165440015 is about 12862.3487357481. The cubic root of 165440015 is about 548.9677774681.

Adding to 165440015 its reverse (510044561), we get a palindrome (675484576).

The spelling of 165440015 in words is "one hundred sixty-five million, four hundred forty thousand, fifteen".