6691358689 has 2 divisors, whose sum is σ = 6691358690. Its totient is φ = 6691358688.

The previous prime is 6691358659. The next prime is 6691358693. The reversal of 6691358689 is 9868531966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4746107664 + 1945251025 = 68892^2 + 44105^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691358689 - 2¹¹ = 6691356641 is a prime.

It is a super-2 number, since 2×6691358689² = 89548562209711597442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6691358659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345679344 + 3345679345.

It is an arithmetic number, because the mean of its divisors is an integer number (3345679345).

Almost surely, 2^6691358689 is an apocalyptic number.

It is an amenable number.

6691358689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691358689 is an equidigital number, since it uses as much as digits as its factorization.

6691358689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16796160, while the sum is 61.

The square root of 6691358689 is about 81800.7254796680. The cubic root of 6691358689 is about 1884.3928031852.

The spelling of 6691358689 in words is "six billion, six hundred ninety-one million, three hundred fifty-eight thousand, six hundred eighty-nine".