165530165 has 4 divisors (see below), whose sum is σ = 198636204. Its totient is φ = 132424128.

The previous prime is 165530153. The next prime is 165530171. The reversal of 165530165 is 561035561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561035561 = 107 ⋅5243323.

It can be written as a sum of positive squares in 2 ways, for example, as 98585041 + 66945124 = 9929^2 + 8182^2 .

It is a cyclic number.

It is not a de Polignac number, because 165530165 - 2²⁴ = 148752949 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 3 ways as a sum of consecutive naturals, for example, 16553012 + ... + 16553021.

It is an arithmetic number, because the mean of its divisors is an integer number (49659051).

Almost surely, 2^165530165 is an apocalyptic number.

It is an amenable number.

165530165 is a deficient number, since it is larger than the sum of its proper divisors (33106039).

165530165 is an equidigital number, since it uses as much as digits as its factorization.

165530165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33106038.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 165530165 is about 12865.8526728702. The cubic root of 165530165 is about 549.0674721293.

The spelling of 165530165 in words is "one hundred sixty-five million, five hundred thirty thousand, one hundred sixty-five".