866788526376613 has 2 divisors, whose sum is σ = 866788526376614. Its totient is φ = 866788526376612.

The previous prime is 866788526376571. The next prime is 866788526376637. The reversal of 866788526376613 is 316673625887668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445530060101889 + 421258466274724 = 21107583^2 + 20524582^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866788526376613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866788526376013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433394263188306 + 433394263188307.

It is an arithmetic number, because the mean of its divisors is an integer number (433394263188307).

Almost surely, 2^{866788526376613} is an apocalyptic number.

It is an amenable number.

866788526376613 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788526376613 is an equidigital number, since it uses as much as digits as its factorization.

866788526376613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17557585920, while the sum is 82.

The spelling of 866788526376613 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-six million, three hundred seventy-six thousand, six hundred thirteen".