165515506 has 16 divisors (see below), whose sum is σ = 268579584. Its totient is φ = 76046544.

The previous prime is 165515503. The next prime is 165515531. The reversal of 165515506 is 605515561.

It is not an unprimeable number, because it can be changed into a prime (165515503) 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, 8476 + ... + 20071.

It is an arithmetic number, because the mean of its divisors is an integer number (16786224).

Almost surely, 2^165515506 is an apocalyptic number.

165515506 is a deficient number, since it is larger than the sum of its proper divisors (103064078).

165515506 is a wasteful number, since it uses less digits than its factorization.

165515506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28785.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 165515506 is about 12865.2829739575. The cubic root of 165515506 is about 549.0512635676.

It can be divided in two parts, 1655 and 15506, that added together give a square (17161 = 131²).

The spelling of 165515506 in words is "one hundred sixty-five million, five hundred fifteen thousand, five hundred six".