163165725 has 24 divisors (see below), whose sum is σ = 299742720. Its totient is φ = 87021360.

The previous prime is 163165721. The next prime is 163165753. The reversal of 163165725 is 527561361.

It is not a de Polignac number, because 163165725 - 2² = 163165721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163165725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163165721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120189 + ... + 121538.

It is an arithmetic number, because the mean of its divisors is an integer number (12489280).

Almost surely, 2^163165725 is an apocalyptic number.

163165725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163165725 is a deficient number, since it is larger than the sum of its proper divisors (136576995).

163165725 is a wasteful number, since it uses less digits than its factorization.

163165725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241746 (or 241735 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 163165725 is about 12773.6339778467. The cubic root of 163165725 is about 546.4406236700.

The spelling of 163165725 in words is "one hundred sixty-three million, one hundred sixty-five thousand, seven hundred twenty-five".