665717725 has 12 divisors (see below), whose sum is σ = 868937440. Its totient is φ = 504543600.

The previous prime is 665717719. The next prime is 665717749. The reversal of 665717725 is 527717566.

It is not a de Polignac number, because 665717725 - 2¹⁷ = 665586653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 700281 + ... + 701230.

Almost surely, 2^665717725 is an apocalyptic number.

It is an amenable number.

665717725 is a deficient number, since it is larger than the sum of its proper divisors (203219715).

665717725 is a wasteful number, since it uses less digits than its factorization.

665717725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401540 (or 1401535 counting only the distinct ones).

The product of its digits is 617400, while the sum is 46.

The square root of 665717725 is about 25801.5062544806. The cubic root of 665717725 is about 873.1657794669.

The spelling of 665717725 in words is "six hundred sixty-five million, seven hundred seventeen thousand, seven hundred twenty-five".