8256881609 has 2 divisors, whose sum is σ = 8256881610. Its totient is φ = 8256881608.

The previous prime is 8256881599. The next prime is 8256881621. The reversal of 8256881609 is 9061886528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7788592009 + 468289600 = 88253^2 + 21640^2 .

It is a cyclic number.

It is not a de Polignac number, because 8256881609 - 2⁴ = 8256881593 is a prime.

It is not a weakly prime, because it can be changed into another prime (8256881669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4128440804 + 4128440805.

It is an arithmetic number, because the mean of its divisors is an integer number (4128440805).

Almost surely, 2^8256881609 is an apocalyptic number.

It is an amenable number.

8256881609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8256881609 is an equidigital number, since it uses as much as digits as its factorization.

8256881609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The square root of 8256881609 is about 90867.3847373193. The cubic root of 8256881609 is about 2021.1816770745.

The spelling of 8256881609 in words is "eight billion, two hundred fifty-six million, eight hundred eighty-one thousand, six hundred nine".