165515559 has 8 divisors (see below), whose sum is σ = 240749952. Its totient is φ = 100312440.

The previous prime is 165515531. The next prime is 165515561. The reversal of 165515559 is 955515561.

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

It is not a de Polignac number, because 165515559 - 2⁹ = 165515047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165515559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165515569) 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, 2507779 + ... + 2507844.

It is an arithmetic number, because the mean of its divisors is an integer number (30093744).

Almost surely, 2^165515559 is an apocalyptic number.

165515559 is a deficient number, since it is larger than the sum of its proper divisors (75234393).

165515559 is a wasteful number, since it uses less digits than its factorization.

165515559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5015637.

The product of its digits is 168750, while the sum is 42.

The square root of 165515559 is about 12865.2850337643. The cubic root of 165515559 is about 549.0513221718.

The spelling of 165515559 in words is "one hundred sixty-five million, five hundred fifteen thousand, five hundred fifty-nine".