165845331 has 6 divisors (see below), whose sum is σ = 239554380. Its totient is φ = 110563548.

The previous prime is 165845293. The next prime is 165845417. The reversal of 165845331 is 133548561.

165845331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165845331 - 2¹⁰ = 165844307 is a prime.

It is a super-2 number, since 2×165845331² = 55009347628999122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165845531) 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, 9213621 + ... + 9213638.

It is an arithmetic number, because the mean of its divisors is an integer number (39925730).

Almost surely, 2^165845331 is an apocalyptic number.

165845331 is a deficient number, since it is larger than the sum of its proper divisors (73709049).

165845331 is a wasteful number, since it uses less digits than its factorization.

165845331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18427265 (or 18427262 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 165845331 is about 12878.0950066382. The cubic root of 165845331 is about 549.4157222277.

It can be divided in two parts, 165845 and 331, that added together give a triangular number (166176 = T₅₇₆).

The spelling of 165845331 in words is "one hundred sixty-five million, eight hundred forty-five thousand, three hundred thirty-one".