8785661 has 2 divisors, whose sum is σ = 8785662. Its totient is φ = 8785660.

The previous prime is 8785649. The next prime is 8785681. The reversal of 8785661 is 1665878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7873636 + 912025 = 2806^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 8785661 - 2¹⁸ = 8523517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8785681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4392830 + 4392831.

It is an arithmetic number, because the mean of its divisors is an integer number (4392831).

Almost surely, 2^8785661 is an apocalyptic number.

It is an amenable number.

8785661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8785661 is an equidigital number, since it uses as much as digits as its factorization.

8785661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 8785661 is about 2964.0615715602. The cubic root of 8785661 is about 206.3438267928.

The spelling of 8785661 in words is "eight million, seven hundred eighty-five thousand, six hundred sixty-one".