725372661 has 8 divisors (see below), whose sum is σ = 1041560800. Its totient is φ = 446383152.

The previous prime is 725372653. The next prime is 725372663. The reversal of 725372661 is 166273527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 725372661 - 2³ = 725372653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 18599299 = 725372661 / (7 + 2 + 5 + 3 + 7 + 2 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725372663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9299611 + ... + 9299688.

It is an arithmetic number, because the mean of its divisors is an integer number (130195100).

Almost surely, 2^725372661 is an apocalyptic number.

It is an amenable number.

725372661 is a deficient number, since it is larger than the sum of its proper divisors (316188139).

725372661 is a wasteful number, since it uses less digits than its factorization.

725372661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18599315.

The product of its digits is 105840, while the sum is 39.

The square root of 725372661 is about 26932.7432876787. The cubic root of 725372661 is about 898.5047852021.

The spelling of 725372661 in words is "seven hundred twenty-five million, three hundred seventy-two thousand, six hundred sixty-one".