866800082636857 has 2 divisors, whose sum is σ = 866800082636858. Its totient is φ = 866800082636856.

The previous prime is 866800082636797. The next prime is 866800082636861. The reversal of 866800082636857 is 758636280008668.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612041326401961 + 254758756234896 = 24739469^2 + 15961164^2 .

It is a cyclic number.

It is not a de Polignac number, because 866800082636857 - 2⁷ = 866800082636729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866800082636857.

It is not a weakly prime, because it can be changed into another prime (866800082636557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433400041318428 + 433400041318429.

It is an arithmetic number, because the mean of its divisors is an integer number (433400041318429).

Almost surely, 2^{866800082636857} is an apocalyptic number.

It is an amenable number.

866800082636857 is a deficient number, since it is larger than the sum of its proper divisors (1).

866800082636857 is an equidigital number, since it uses as much as digits as its factorization.

866800082636857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1114767360, while the sum is 73.

The spelling of 866800082636857 in words is "eight hundred sixty-six trillion, eight hundred billion, eighty-two million, six hundred thirty-six thousand, eight hundred fifty-seven".