6686789819 has 2 divisors, whose sum is σ = 6686789820. Its totient is φ = 6686789818.

The previous prime is 6686789801. The next prime is 6686789821. The reversal of 6686789819 is 9189876866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6686789819 is a prime.

It is a super-2 number, since 2×6686789819² = 89426316166964105522, which contains 22 as substring.

Together with 6686789821, 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 (6686789849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343394909 + 3343394910.

It is an arithmetic number, because the mean of its divisors is an integer number (3343394910).

Almost surely, 2^6686789819 is an apocalyptic number.

6686789819 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686789819 is an equidigital number, since it uses as much as digits as its factorization.

6686789819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 68.

The square root of 6686789819 is about 81772.7938803610. The cubic root of 6686789819 is about 1883.9638167652.

The spelling of 6686789819 in words is "six billion, six hundred eighty-six million, seven hundred eighty-nine thousand, eight hundred nineteen".