666707725 has 12 divisors (see below), whose sum is σ = 827111124. Its totient is φ = 533112320.

The previous prime is 666707719. The next prime is 666707749. The reversal of 666707725 is 527707666.

It can be written as a sum of positive squares in 6 ways, for example, as 14722569 + 651985156 = 3837^2 + 25534^2 .

It is not a de Polignac number, because 666707725 - 2⁹ = 666707213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61407 + ... + 71443.

It is an arithmetic number, because the mean of its divisors is an integer number (68925927).

Almost surely, 2^666707725 is an apocalyptic number.

It is an amenable number.

666707725 is a deficient number, since it is larger than the sum of its proper divisors (160403399).

666707725 is a wasteful number, since it uses less digits than its factorization.

666707725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12704 (or 12699 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 46.

The square root of 666707725 is about 25820.6840536807. The cubic root of 666707725 is about 873.5983982471.

The spelling of 666707725 in words is "six hundred sixty-six million, seven hundred seven thousand, seven hundred twenty-five".