866786278583833 has 2 divisors, whose sum is σ = 866786278583834. Its totient is φ = 866786278583832.

The previous prime is 866786278583689. The next prime is 866786278583879. The reversal of 866786278583833 is 338385872687668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 593705464709184 + 273080813874649 = 24366072^2 + 16525157^2 .

It is a cyclic number.

It is not a de Polignac number, because 866786278583833 - 2¹⁷ = 866786278452761 is a prime.

It is not a weakly prime, because it can be changed into another prime (866786278583233) 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, 433393139291916 + 433393139291917.

It is an arithmetic number, because the mean of its divisors is an integer number (433393139291917).

Almost surely, 2^{866786278583833} is an apocalyptic number.

It is an amenable number.

866786278583833 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786278583833 is an equidigital number, since it uses as much as digits as its factorization.

866786278583833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93640458240, while the sum is 88.

The spelling of 866786278583833 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-three thousand, eight hundred thirty-three".