866800082636879 has 2 divisors, whose sum is σ = 866800082636880. Its totient is φ = 866800082636878.

The previous prime is 866800082636861. The next prime is 866800082636899. The reversal of 866800082636879 is 978636280008668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866800082636879 - 2¹⁶ = 866800082571343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866800082636899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433400041318439 + 433400041318440.

It is an arithmetic number, because the mean of its divisors is an integer number (433400041318440).

Almost surely, 2^{866800082636879} is an apocalyptic number.

866800082636879 is a deficient number, since it is larger than the sum of its proper divisors (1).

866800082636879 is an equidigital number, since it uses as much as digits as its factorization.

866800082636879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2006581248, while the sum is 77.

The spelling of 866800082636879 in words is "eight hundred sixty-six trillion, eight hundred billion, eighty-two million, six hundred thirty-six thousand, eight hundred seventy-nine".