725607665 has 16 divisors (see below), whose sum is σ = 886671360. Its totient is φ = 569884800.

The previous prime is 725607647. The next prime is 725607713. The reversal of 725607665 is 566706527.

It is not a de Polignac number, because 725607665 - 2⁶ = 725607601 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338477 + ... + 340613.

It is an arithmetic number, because the mean of its divisors is an integer number (55416960).

Almost surely, 2^725607665 is an apocalyptic number.

It is an amenable number.

725607665 is a deficient number, since it is larger than the sum of its proper divisors (161063695).

725607665 is a wasteful number, since it uses less digits than its factorization.

725607665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352.

The product of its (nonzero) digits is 529200, while the sum is 44.

The square root of 725607665 is about 26937.1057279731. The cubic root of 725607665 is about 898.6018063294.

The spelling of 725607665 in words is "seven hundred twenty-five million, six hundred seven thousand, six hundred sixty-five".