165515560 has 32 divisors (see below), whose sum is σ = 425612160. Its totient is φ = 56748096.

The previous prime is 165515531. The next prime is 165515561. The reversal of 165515560 is 65515561.

It is a super-2 number, since 2×165515560² = 54790801204227200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165515561) 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 7 ways as a sum of consecutive naturals, for example, 295284 + ... + 295843.

It is an arithmetic number, because the mean of its divisors is an integer number (13300380).

Almost surely, 2^165515560 is an apocalyptic number.

165515560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165515560 is an abundant number, since it is smaller than the sum of its proper divisors (260096600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165515560 is a wasteful number, since it uses less digits than its factorization.

165515560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591145 (or 591141 counting only the distinct ones).

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

The square root of 165515560 is about 12865.2850726286. The cubic root of 165515560 is about 549.0513232776.

Subtracting from 165515560 its reverse (65515561), we obtain a palindrome (99999999).

The spelling of 165515560 in words is "one hundred sixty-five million, five hundred fifteen thousand, five hundred sixty".