165539560 has 16 divisors (see below), whose sum is σ = 372464100. Its totient is φ = 66215808.

The previous prime is 165539531. The next prime is 165539573. The reversal of 165539560 is 65935561.

It can be written as a sum of positive squares in 2 ways, for example, as 164198596 + 1340964 = 12814^2 + 1158^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 4138489 = 165539560 / (1 + 6 + 5 + 5 + 3 + 9 + 5 + 6 + 0).

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, 2069205 + ... + 2069284.

Almost surely, 2^165539560 is an apocalyptic number.

165539560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165539560 is an abundant number, since it is smaller than the sum of its proper divisors (206924540).

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

165539560 is a wasteful number, since it uses less digits than its factorization.

165539560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138500 (or 4138496 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 165539560 is about 12866.2177814617. The cubic root of 165539560 is about 549.0778597452.

The spelling of 165539560 in words is "one hundred sixty-five million, five hundred thirty-nine thousand, five hundred sixty".