864806577889 has 2 divisors, whose sum is σ = 864806577890. Its totient is φ = 864806577888.

The previous prime is 864806577881. The next prime is 864806577983. The reversal of 864806577889 is 988775608468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863459100625 + 1347477264 = 929225^2 + 36708^2 .

It is a cyclic number.

It is not a de Polignac number, because 864806577889 - 2³ = 864806577881 is a prime.

It is not a weakly prime, because it can be changed into another prime (864806577881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432403288944 + 432403288945.

It is an arithmetic number, because the mean of its divisors is an integer number (432403288945).

Almost surely, 2^864806577889 is an apocalyptic number.

It is an amenable number.

864806577889 is a deficient number, since it is larger than the sum of its proper divisors (1).

864806577889 is an equidigital number, since it uses as much as digits as its factorization.

864806577889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1300561920, while the sum is 76.

The spelling of 864806577889 in words is "eight hundred sixty-four billion, eight hundred six million, five hundred seventy-seven thousand, eight hundred eighty-nine".