866800082636557 has 2 divisors, whose sum is σ = 866800082636558. Its totient is φ = 866800082636556.

The previous prime is 866800082636507. The next prime is 866800082636573. The reversal of 866800082636557 is 755636280008668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434839518073636 + 431960564562921 = 20852806^2 + 20783661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866800082636557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866800082636507) 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, 433400041318278 + 433400041318279.

It is an arithmetic number, because the mean of its divisors is an integer number (433400041318279).

Almost surely, 2^{866800082636557} is an apocalyptic number.

It is an amenable number.

866800082636557 is a deficient number, since it is larger than the sum of its proper divisors (1).

866800082636557 is an equidigital number, since it uses as much as digits as its factorization.

866800082636557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 696729600, while the sum is 70.

The spelling of 866800082636557 in words is "eight hundred sixty-six trillion, eight hundred billion, eighty-two million, six hundred thirty-six thousand, five hundred fifty-seven".