805127857489 has 2 divisors, whose sum is σ = 805127857490. Its totient is φ = 805127857488.

The previous prime is 805127857487. The next prime is 805127857537. The reversal of 805127857489 is 984758721508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 785291951889 + 19835905600 = 886167^2 + 140840^2 .

It is a cyclic number.

It is not a de Polignac number, because 805127857489 - 2¹ = 805127857487 is a prime.

Together with 805127857487, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 805127857489.

It is not a weakly prime, because it can be changed into another prime (805127857487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402563928744 + 402563928745.

It is an arithmetic number, because the mean of its divisors is an integer number (402563928745).

Almost surely, 2^805127857489 is an apocalyptic number.

It is an amenable number.

805127857489 is a deficient number, since it is larger than the sum of its proper divisors (1).

805127857489 is an equidigital number, since it uses as much as digits as its factorization.

805127857489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45158400, while the sum is 64.

The spelling of 805127857489 in words is "eight hundred five billion, one hundred twenty-seven million, eight hundred fifty-seven thousand, four hundred eighty-nine".