165528261 has 6 divisors (see below), whose sum is σ = 239096390. Its totient is φ = 110352168.

The previous prime is 165528221. The next prime is 165528277. The reversal of 165528261 is 162825561.

It can be written as a sum of positive squares in only one way, i.e., 123343236 + 42185025 = 11106^2 + 6495^2 .

It is not a de Polignac number, because 165528261 - 2¹⁰ = 165527237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165528211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9196006 + ... + 9196023.

Almost surely, 2^165528261 is an apocalyptic number.

It is an amenable number.

165528261 is a deficient number, since it is larger than the sum of its proper divisors (73568129).

165528261 is a wasteful number, since it uses less digits than its factorization.

165528261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18392035 (or 18392032 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 165528261 is about 12865.7786783389. The cubic root of 165528261 is about 549.0653669169.

The spelling of 165528261 in words is "one hundred sixty-five million, five hundred twenty-eight thousand, two hundred sixty-one".