725657165 has 4 divisors (see below), whose sum is σ = 870788604. Its totient is φ = 580525728.

The previous prime is 725657161. The next prime is 725657167. The reversal of 725657165 is 561756527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 556110724 + 169546441 = 23582^2 + 13021^2 .

It is a cyclic number.

It is not a de Polignac number, because 725657165 - 2² = 725657161 is a prime.

It is a super-2 number, since 2×725657165² = 1053156642231674450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725657161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72565712 + ... + 72565721.

It is an arithmetic number, because the mean of its divisors is an integer number (217697151).

Almost surely, 2^725657165 is an apocalyptic number.

It is an amenable number.

725657165 is a deficient number, since it is larger than the sum of its proper divisors (145131439).

725657165 is a wasteful number, since it uses less digits than its factorization.

725657165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145131438.

The product of its digits is 441000, while the sum is 44.

The square root of 725657165 is about 26938.0245192553. The cubic root of 725657165 is about 898.6222396756.

The spelling of 725657165 in words is "seven hundred twenty-five million, six hundred fifty-seven thousand, one hundred sixty-five".