165353881 has 27 divisors (see below), whose sum is σ = 212700117. Its totient is φ = 128075640.

The previous prime is 165353843. The next prime is 165353891. The reversal of 165353881 is 188353561.

The square root of 165353881 is 12859.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 165353881 - 2¹⁹ = 164829593 is a prime.

It is a super-2 number, since 2×165353881² = 54683811923524322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165353821) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 990060 + ... + 990226.

Almost surely, 2^165353881 is an apocalyptic number.

165353881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165353881 is the 12859-th square number.

165353881 is the 6430-th centered octagonal number.

It is an amenable number.

165353881 is a deficient number, since it is larger than the sum of its proper divisors (47346236).

165353881 is an equidigital number, since it uses as much as digits as its factorization.

165353881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 185 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The cubic root of 165353881 is about 548.8724901642.

The spelling of 165353881 in words is "one hundred sixty-five million, three hundred fifty-three thousand, eight hundred eighty-one".