666712625 has 32 divisors (see below), whose sum is σ = 854889984. Its totient is φ = 518880000.

The previous prime is 666712619. The next prime is 666712633. The reversal of 666712625 is 526217666.

It is not a de Polignac number, because 666712625 - 2⁴ = 666712609 is a prime.

It is a Duffinian 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 31 ways as a sum of consecutive naturals, for example, 1662425 + ... + 1662825.

It is an arithmetic number, because the mean of its divisors is an integer number (26715312).

Almost surely, 2^666712625 is an apocalyptic number.

It is an amenable number.

666712625 is a deficient number, since it is larger than the sum of its proper divisors (188177359).

666712625 is a wasteful number, since it uses less digits than its factorization.

666712625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 736 counting only the distinct ones).

The product of its digits is 181440, while the sum is 41.

The square root of 666712625 is about 25820.7789386765. The cubic root of 666712625 is about 873.6005384261.

It can be divided in two parts, 66671 and 2625, that added together give a palindrome (69296).

The spelling of 666712625 in words is "six hundred sixty-six million, seven hundred twelve thousand, six hundred twenty-five".