866800082807551 has 2 divisors, whose sum is σ = 866800082807552. Its totient is φ = 866800082807550.

The previous prime is 866800082807543. The next prime is 866800082807641. The reversal of 866800082807551 is 155708280008668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866800082807551 - 2³ = 866800082807543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866800082805551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433400041403775 + 433400041403776.

It is an arithmetic number, because the mean of its divisors is an integer number (433400041403776).

Almost surely, 2^{866800082807551} is an apocalyptic number.

866800082807551 is a deficient number, since it is larger than the sum of its proper divisors (1).

866800082807551 is an equidigital number, since it uses as much as digits as its factorization.

866800082807551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51609600, while the sum is 64.

The spelling of 866800082807551 in words is "eight hundred sixty-six trillion, eight hundred billion, eighty-two million, eight hundred seven thousand, five hundred fifty-one".