725201666 has 24 divisors (see below), whose sum is σ = 1309042620. Its totient is φ = 300082272.

The previous prime is 725201647. The next prime is 725201669. The reversal of 725201666 is 666102527.

It can be written as a sum of positive squares in 2 ways, for example, as 725171041 + 30625 = 26929^2 + 175^2 .

It is not an unprimeable number, because it can be changed into a prime (725201669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124745 + ... + 130428.

Almost surely, 2^725201666 is an apocalyptic number.

725201666 is a deficient number, since it is larger than the sum of its proper divisors (583840954).

725201666 is a wasteful number, since it uses less digits than its factorization.

725201666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255218 (or 255211 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 725201666 is about 26929.5686188992. The cubic root of 725201666 is about 898.4341769441.

The spelling of 725201666 in words is "seven hundred twenty-five million, two hundred one thousand, six hundred sixty-six".