26974665918689 has 2 divisors, whose sum is σ = 26974665918690. Its totient is φ = 26974665918688.

The previous prime is 26974665918679. The next prime is 26974665918749. The reversal of 26974665918689 is 98681956647962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24149214214225 + 2825451704464 = 4914185^2 + 1680908^2 .

It is a cyclic number.

It is not a de Polignac number, because 26974665918689 - 2³⁶ = 26905946441953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26974665918689.

It is not a weakly prime, because it can be changed into another prime (26974665918619) 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, 13487332959344 + 13487332959345.

It is an arithmetic number, because the mean of its divisors is an integer number (13487332959345).

Almost surely, 2^{26974665918689} is an apocalyptic number.

It is an amenable number.

26974665918689 is a deficient number, since it is larger than the sum of its proper divisors (1).

26974665918689 is an equidigital number, since it uses as much as digits as its factorization.

26974665918689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16930529280, while the sum is 86.

The spelling of 26974665918689 in words is "twenty-six trillion, nine hundred seventy-four billion, six hundred sixty-five million, nine hundred eighteen thousand, six hundred eighty-nine".