8661818843 has 2 divisors, whose sum is σ = 8661818844. Its totient is φ = 8661818842.

The previous prime is 8661818813. The next prime is 8661818899. The reversal of 8661818843 is 3488181668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8661818843 - 2¹⁰ = 8661817819 is a prime.

It is not a weakly prime, because it can be changed into another prime (8661818813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330909421 + 4330909422.

It is an arithmetic number, because the mean of its divisors is an integer number (4330909422).

Almost surely, 2^8661818843 is an apocalyptic number.

8661818843 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661818843 is an equidigital number, since it uses as much as digits as its factorization.

8661818843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1769472, while the sum is 53.

The square root of 8661818843 is about 93068.8929933090. The cubic root of 8661818843 is about 2053.6969848214.

The spelling of 8661818843 in words is "eight billion, six hundred sixty-one million, eight hundred eighteen thousand, eight hundred forty-three".