6680818586989 has 2 divisors, whose sum is σ = 6680818586990. Its totient is φ = 6680818586988.

The previous prime is 6680818586987. The next prime is 6680818587017. The reversal of 6680818586989 is 9896858180866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3588971113764 + 3091847473225 = 1894458^2 + 1758365^2 .

It is a cyclic number.

It is not a de Polignac number, because 6680818586989 - 2¹ = 6680818586987 is a prime.

It is a super-2 number, since 2×6680818586989² (a number of 26 digits) contains 22 as substring.

Together with 6680818586987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6680818586987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340409293494 + 3340409293495.

It is an arithmetic number, because the mean of its divisors is an integer number (3340409293495).

Almost surely, 2^{6680818586989} is an apocalyptic number.

It is an amenable number.

6680818586989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6680818586989 is an equidigital number, since it uses as much as digits as its factorization.

6680818586989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2866544640, while the sum is 82.

The spelling of 6680818586989 in words is "six trillion, six hundred eighty billion, eight hundred eighteen million, five hundred eighty-six thousand, nine hundred eighty-nine".