7866996689 has 2 divisors, whose sum is σ = 7866996690. Its totient is φ = 7866996688.

The previous prime is 7866996679. The next prime is 7866996691. The reversal of 7866996689 is 9866996687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5150502289 + 2716494400 = 71767^2 + 52120^2 .

It is a cyclic number.

It is not a de Polignac number, because 7866996689 - 2²⁴ = 7850219473 is a prime.

Together with 7866996691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7866996649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3933498344 + 3933498345.

It is an arithmetic number, because the mean of its divisors is an integer number (3933498345).

Almost surely, 2^7866996689 is an apocalyptic number.

It is an amenable number.

7866996689 is a deficient number, since it is larger than the sum of its proper divisors (1).

7866996689 is an equidigital number, since it uses as much as digits as its factorization.

7866996689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423263232, while the sum is 74.

The square root of 7866996689 is about 88696.0917346418. The cubic root of 7866996689 is about 1988.8543938617.

The spelling of 7866996689 in words is "seven billion, eight hundred sixty-six million, nine hundred ninety-six thousand, six hundred eighty-nine".