725492665 has 4 divisors (see below), whose sum is σ = 870591204. Its totient is φ = 580394128.

The previous prime is 725492653. The next prime is 725492693. The reversal of 725492665 is 566294527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566294527 = 11959 ⋅47353.

It can be written as a sum of positive squares in 2 ways, for example, as 390931984 + 334560681 = 19772^2 + 18291^2 .

It is a cyclic number.

It is not a de Polignac number, because 725492665 - 2¹¹ = 725490617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72549262 + ... + 72549271.

It is an arithmetic number, because the mean of its divisors is an integer number (217647801).

Almost surely, 2^725492665 is an apocalyptic number.

It is an amenable number.

725492665 is a deficient number, since it is larger than the sum of its proper divisors (145098539).

725492665 is a wasteful number, since it uses less digits than its factorization.

725492665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145098538.

The product of its digits is 907200, while the sum is 46.

The square root of 725492665 is about 26934.9710413804. The cubic root of 725492665 is about 898.5543313313.

The spelling of 725492665 in words is "seven hundred twenty-five million, four hundred ninety-two thousand, six hundred sixty-five".