8866009006861 has 2 divisors, whose sum is σ = 8866009006862. Its totient is φ = 8866009006860.

The previous prime is 8866009006837. The next prime is 8866009006891. The reversal of 8866009006861 is 1686009006688.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8473519286761 + 392489720100 = 2910931^2 + 626490^2 .

It is a cyclic number.

It is not a de Polignac number, because 8866009006861 - 2²⁵ = 8865975452429 is a prime.

It is a super-2 number, since 2×8866009006861² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8866009006796 and 8866009006805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8866009006891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4433004503430 + 4433004503431.

It is an arithmetic number, because the mean of its divisors is an integer number (4433004503431).

Almost surely, 2^{8866009006861} is an apocalyptic number.

It is an amenable number.

8866009006861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8866009006861 is an equidigital number, since it uses as much as digits as its factorization.

8866009006861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 58.

The spelling of 8866009006861 in words is "eight trillion, eight hundred sixty-six billion, nine million, six thousand, eight hundred sixty-one".