725318661 has 16 divisors (see below), whose sum is σ = 973087808. Its totient is φ = 480556800.

The previous prime is 725318611. The next prime is 725318677. The reversal of 725318661 is 166813527.

It is not a de Polignac number, because 725318661 - 2⁹ = 725318149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725318611) 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, 585735 + ... + 586971.

It is an arithmetic number, because the mean of its divisors is an integer number (60817988).

Almost surely, 2^725318661 is an apocalyptic number.

It is an amenable number.

725318661 is a deficient number, since it is larger than the sum of its proper divisors (247769147).

725318661 is a wasteful number, since it uses less digits than its factorization.

725318661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292.

The product of its digits is 60480, while the sum is 39.

The square root of 725318661 is about 26931.7407718105. The cubic root of 725318661 is about 898.4824884044.

The spelling of 725318661 in words is "seven hundred twenty-five million, three hundred eighteen thousand, six hundred sixty-one".