8686812689 has 2 divisors, whose sum is σ = 8686812690. Its totient is φ = 8686812688.

The previous prime is 8686812671. The next prime is 8686812697. The reversal of 8686812689 is 9862186868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8329300225 + 357512464 = 91265^2 + 18908^2 .

It is a cyclic number.

It is not a de Polignac number, because 8686812689 - 2¹² = 8686808593 is a prime.

It is not a weakly prime, because it can be changed into another prime (8686812289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4343406344 + 4343406345.

It is an arithmetic number, because the mean of its divisors is an integer number (4343406345).

Almost surely, 2^8686812689 is an apocalyptic number.

It is an amenable number.

8686812689 is a deficient number, since it is larger than the sum of its proper divisors (1).

8686812689 is an equidigital number, since it uses as much as digits as its factorization.

8686812689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15925248, while the sum is 62.

The square root of 8686812689 is about 93203.0723152408. The cubic root of 8686812689 is about 2055.6704153853.

The spelling of 8686812689 in words is "eight billion, six hundred eighty-six million, eight hundred twelve thousand, six hundred eighty-nine".