805838861801 has 2 divisors, whose sum is σ = 805838861802. Its totient is φ = 805838861800.

The previous prime is 805838861771. The next prime is 805838861837. The reversal of 805838861801 is 108168838508.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 691310765401 + 114528096400 = 831451^2 + 338420^2 .

It is a cyclic number.

It is not a de Polignac number, because 805838861801 - 2¹⁰ = 805838860777 is a prime.

It is not a weakly prime, because it can be changed into another prime (805838861701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402919430900 + 402919430901.

It is an arithmetic number, because the mean of its divisors is an integer number (402919430901).

Almost surely, 2^805838861801 is an apocalyptic number.

It is an amenable number.

805838861801 is a deficient number, since it is larger than the sum of its proper divisors (1).

805838861801 is an equidigital number, since it uses as much as digits as its factorization.

805838861801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2949120, while the sum is 56.

The spelling of 805838861801 in words is "eight hundred five billion, eight hundred thirty-eight million, eight hundred sixty-one thousand, eight hundred one".