866123857473859 has 2 divisors, whose sum is σ = 866123857473860. Its totient is φ = 866123857473858.

The previous prime is 866123857473821. The next prime is 866123857473871. The reversal of 866123857473859 is 958374758321668.

866123857473859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866123857473859 - 2¹⁷ = 866123857342787 is a prime.

It is not a weakly prime, because it can be changed into another prime (866123857473659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433061928736929 + 433061928736930.

It is an arithmetic number, because the mean of its divisors is an integer number (433061928736930).

Almost surely, 2^{866123857473859} is an apocalyptic number.

866123857473859 is a deficient number, since it is larger than the sum of its proper divisors (1).

866123857473859 is an equidigital number, since it uses as much as digits as its factorization.

866123857473859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14631321600, while the sum is 82.

The spelling of 866123857473859 in words is "eight hundred sixty-six trillion, one hundred twenty-three billion, eight hundred fifty-seven million, four hundred seventy-three thousand, eight hundred fifty-nine".