665659725 has 12 divisors (see below), whose sum is σ = 1100557536. Its totient is φ = 355018480.

The previous prime is 665659717. The next prime is 665659759. The reversal of 665659725 is 527956566.

It is not a de Polignac number, because 665659725 - 2³ = 665659717 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, 4437657 + ... + 4437806.

It is an arithmetic number, because the mean of its divisors is an integer number (91713128).

Almost surely, 2^665659725 is an apocalyptic number.

It is an amenable number.

665659725 is a deficient number, since it is larger than the sum of its proper divisors (434897811).

665659725 is a wasteful number, since it uses less digits than its factorization.

665659725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8875476 (or 8875471 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 51.

The square root of 665659725 is about 25800.3822646100. The cubic root of 665659725 is about 873.1404208280.

The spelling of 665659725 in words is "six hundred sixty-five million, six hundred fifty-nine thousand, seven hundred twenty-five".