8656661 has 4 divisors (see below), whose sum is σ = 9322572. Its totient is φ = 7990752.

The previous prime is 8656603. The next prime is 8656667. The reversal of 8656661 is 1666568.

8656661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1739761 + 6916900 = 1319^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 8656661 - 2¹⁰ = 8655637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8656667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332936 + ... + 332961.

It is an arithmetic number, because the mean of its divisors is an integer number (2330643).

Almost surely, 2^8656661 is an apocalyptic number.

It is an amenable number.

8656661 is a deficient number, since it is larger than the sum of its proper divisors (665911).

8656661 is a wasteful number, since it uses less digits than its factorization.

8656661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665910.

The product of its digits is 51840, while the sum is 38.

The square root of 8656661 is about 2942.2204200229. The cubic root of 8656661 is about 205.3289266380.

The spelling of 8656661 in words is "eight million, six hundred fifty-six thousand, six hundred sixty-one".