666007725 has 36 divisors (see below), whose sum is σ = 1169753504. Its totient is φ = 334298880.

The previous prime is 666007721. The next prime is 666007747. The reversal of 666007725 is 527700666.

It is not a de Polignac number, because 666007725 - 2² = 666007721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666007721) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 6312 + ... + 37038.

Almost surely, 2^666007725 is an apocalyptic number.

It is an amenable number.

666007725 is a deficient number, since it is larger than the sum of its proper divisors (503745779).

666007725 is a wasteful number, since it uses less digits than its factorization.

666007725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30774 (or 30752 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 666007725 is about 25807.1254695288. The cubic root of 666007725 is about 873.2925505724.

The spelling of 666007725 in words is "six hundred sixty-six million, seven thousand, seven hundred twenty-five".