808791368821 has 2 divisors, whose sum is σ = 808791368822. Its totient is φ = 808791368820.

The previous prime is 808791368779. The next prime is 808791368837. The reversal of 808791368821 is 128863197808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 704400989796 + 104390379025 = 839286^2 + 323095^2 .

It is a cyclic number.

It is not a de Polignac number, because 808791368821 - 2²¹ = 808789271669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 808791368821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808791368851) 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, 404395684410 + 404395684411.

It is an arithmetic number, because the mean of its divisors is an integer number (404395684411).

Almost surely, 2^808791368821 is an apocalyptic number.

It is an amenable number.

808791368821 is a deficient number, since it is larger than the sum of its proper divisors (1).

808791368821 is an equidigital number, since it uses as much as digits as its factorization.

808791368821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9289728, while the sum is 61.

The spelling of 808791368821 in words is "eight hundred eight billion, seven hundred ninety-one million, three hundred sixty-eight thousand, eight hundred twenty-one".