8166666025 has 12 divisors (see below), whose sum is σ = 11573332672. Its totient is φ = 5599999440.

The previous prime is 8166666007. The next prime is 8166666049. The reversal of 8166666025 is 5206666618.

It is not a de Polignac number, because 8166666025 - 2⁵ = 8166665993 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 (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23333157 + ... + 23333506.

Almost surely, 2^8166666025 is an apocalyptic number.

It is an amenable number.

8166666025 is a deficient number, since it is larger than the sum of its proper divisors (3406666647).

8166666025 is a wasteful number, since it uses less digits than its factorization.

8166666025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46666680 (or 46666675 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 8166666025 is about 90369.6078612716. The cubic root of 8166666025 is about 2013.7934865845.

The spelling of 8166666025 in words is "eight billion, one hundred sixty-six million, six hundred sixty-six thousand, twenty-five".