165725331 has 16 divisors (see below), whose sum is σ = 229824000. Its totient is φ = 106131168.

The previous prime is 165725323. The next prime is 165725341. The reversal of 165725331 is 133527561.

It is not a de Polignac number, because 165725331 - 2³ = 165725323 is a prime.

It is a super-2 number, since 2×165725331² = 54929770670119122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165725292 and 165725301.

It is not an unprimeable number, because it can be changed into a prime (165725341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681 + ... + 18218.

It is an arithmetic number, because the mean of its divisors is an integer number (14364000).

Almost surely, 2^165725331 is an apocalyptic number.

165725331 is a deficient number, since it is larger than the sum of its proper divisors (64098669).

165725331 is a wasteful number, since it uses less digits than its factorization.

165725331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19018.

The product of its digits is 18900, while the sum is 33.

The square root of 165725331 is about 12873.4350893613. The cubic root of 165725331 is about 549.2831774560.

The spelling of 165725331 in words is "one hundred sixty-five million, seven hundred twenty-five thousand, three hundred thirty-one".