866786517366811 has 2 divisors, whose sum is σ = 866786517366812. Its totient is φ = 866786517366810.

The previous prime is 866786517366779. The next prime is 866786517366821. The reversal of 866786517366811 is 118663715687668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866786517366811 - 2⁵ = 866786517366779 is a prime.

It is not a weakly prime, because it can be changed into another prime (866786517366821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433393258683405 + 433393258683406.

It is an arithmetic number, because the mean of its divisors is an integer number (433393258683406).

Almost surely, 2^{866786517366811} is an apocalyptic number.

866786517366811 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786517366811 is an equidigital number, since it uses as much as digits as its factorization.

866786517366811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2926264320, while the sum is 79.

The spelling of 866786517366811 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred seventeen million, three hundred sixty-six thousand, eight hundred eleven".