165530525 has 12 divisors (see below), whose sum is σ = 205850292. Its totient is φ = 132042240.

The previous prime is 165530509. The next prime is 165530537. The reversal of 165530525 is 525035561.

It can be written as a sum of positive squares in 6 ways, for example, as 3171961 + 162358564 = 1781^2 + 12742^2 .

It is not a de Polignac number, because 165530525 - 2⁴ = 165530509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165530491 and 165530500.

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, 554 + ... + 18203.

It is an arithmetic number, because the mean of its divisors is an integer number (17154191).

Almost surely, 2^165530525 is an apocalyptic number.

It is an amenable number.

165530525 is a deficient number, since it is larger than the sum of its proper divisors (40319767).

165530525 is a wasteful number, since it uses less digits than its factorization.

165530525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19120 (or 19115 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 165530525 is about 12865.8666633849. The cubic root of 165530525 is about 549.0678701719.

The spelling of 165530525 in words is "one hundred sixty-five million, five hundred thirty thousand, five hundred twenty-five".