866786278383811 has 2 divisors, whose sum is σ = 866786278383812. Its totient is φ = 866786278383810.

The previous prime is 866786278383793. The next prime is 866786278383827. The reversal of 866786278383811 is 118383872687668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866786278383811 is a prime.

It is not a weakly prime, because it can be changed into another prime (866786278383611) 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, 433393139191905 + 433393139191906.

It is an arithmetic number, because the mean of its divisors is an integer number (433393139191906).

Almost surely, 2^{866786278383811} is an apocalyptic number.

866786278383811 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786278383811 is an equidigital number, since it uses as much as digits as its factorization.

866786278383811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6242697216, while the sum is 82.

The spelling of 866786278383811 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, three hundred eighty-three thousand, eight hundred eleven".