8709686007989 has 2 divisors, whose sum is σ = 8709686007990. Its totient is φ = 8709686007988.

The previous prime is 8709686007943. The next prime is 8709686008039. The reversal of 8709686007989 is 9897006869078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8499656283889 + 210029724100 = 2915417^2 + 458290^2 .

It is a cyclic number.

It is not a de Polignac number, because 8709686007989 - 2⁸ = 8709686007733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8709686007389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4354843003994 + 4354843003995.

It is an arithmetic number, because the mean of its divisors is an integer number (4354843003995).

Almost surely, 2^{8709686007989} is an apocalyptic number.

It is an amenable number.

8709686007989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8709686007989 is an equidigital number, since it uses as much as digits as its factorization.

8709686007989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658409472, while the sum is 77.

The spelling of 8709686007989 in words is "eight trillion, seven hundred nine billion, six hundred eighty-six million, seven thousand, nine hundred eighty-nine".