666330625 has 20 divisors (see below), whose sum is σ = 840371620. Its totient is φ = 528120000.

The previous prime is 666330619. The next prime is 666330649. The reversal of 666330625 is 526033666.

666330625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 10 ways, for example, as 473454081 + 192876544 = 21759^2 + 13888^2 .

It is not a de Polignac number, because 666330625 - 2²¹ = 664233473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 63235 + ... + 73015.

It is an arithmetic number, because the mean of its divisors is an integer number (42018581).

Almost surely, 2^666330625 is an apocalyptic number.

It is an amenable number.

666330625 is a deficient number, since it is larger than the sum of its proper divisors (174040995).

666330625 is an equidigital number, since it uses as much as digits as its factorization.

666330625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9910 (or 9895 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 37.

The square root of 666330625 is about 25813.3807355798. The cubic root of 666330625 is about 873.4336603497.

The spelling of 666330625 in words is "six hundred sixty-six million, three hundred thirty thousand, six hundred twenty-five".