266713641322789 has 2 divisors, whose sum is σ = 266713641322790. Its totient is φ = 266713641322788.

The previous prime is 266713641322787. The next prime is 266713641322801. The reversal of 266713641322789 is 987223146317662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258310791202500 + 8402850120289 = 16072050^2 + 2898767^2 .

It is a cyclic number.

It is not a de Polignac number, because 266713641322789 - 2¹ = 266713641322787 is a prime.

It is a super-2 number, since 2×266713641322789² (a number of 30 digits) contains 22 as substring.

Together with 266713641322787, 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 (266713641322783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133356820661394 + 133356820661395.

It is an arithmetic number, because the mean of its divisors is an integer number (133356820661395).

Almost surely, 2^{266713641322789} is an apocalyptic number.

It is an amenable number.

266713641322789 is a deficient number, since it is larger than the sum of its proper divisors (1).

266713641322789 is an equidigital number, since it uses as much as digits as its factorization.

266713641322789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 67.

The spelling of 266713641322789 in words is "two hundred sixty-six trillion, seven hundred thirteen billion, six hundred forty-one million, three hundred twenty-two thousand, seven hundred eighty-nine".