6668888888989 has 2 divisors, whose sum is σ = 6668888888990. Its totient is φ = 6668888888988.

The previous prime is 6668888888971. The next prime is 6668888889017. The reversal of 6668888888989 is 9898888888666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6012720847225 + 656168041764 = 2452085^2 + 810042^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668888888989 - 2⁷ = 6668888888861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6668888888894 and 6668888888903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668888888089) 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, 3334444444494 + 3334444444495.

It is an arithmetic number, because the mean of its divisors is an integer number (3334444444495).

Almost surely, 2^{6668888888989} is an apocalyptic number.

It is an amenable number.

6668888888989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668888888989 is an equidigital number, since it uses as much as digits as its factorization.

6668888888989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 293534171136, while the sum is 100.

The spelling of 6668888888989 in words is "six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, nine hundred eighty-nine".