165515552 has 12 divisors (see below), whose sum is σ = 325858806. Its totient is φ = 82757760.

The previous prime is 165515531. The next prime is 165515561. The reversal of 165515552 is 255515561.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 157653136 + 7862416 = 12556^2 + 2804^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2586149 + ... + 2586212.

Almost surely, 2^165515552 is an apocalyptic number.

It is an amenable number.

165515552 is a deficient number, since it is larger than the sum of its proper divisors (160343254).

165515552 is an equidigital number, since it uses as much as digits as its factorization.

165515552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172371 (or 5172363 counting only the distinct ones).

The product of its digits is 37500, while the sum is 35.

The square root of 165515552 is about 12865.2847617144. The cubic root of 165515552 is about 549.0513144316.

Subtracting 165515552 from its reverse (255515561), we obtain a palindrome (90000009).

The spelling of 165515552 in words is "one hundred sixty-five million, five hundred fifteen thousand, five hundred fifty-two".