8221163809 has 2 divisors, whose sum is σ = 8221163810. Its totient is φ = 8221163808.

The previous prime is 8221163801. The next prime is 8221163869. The reversal of 8221163809 is 9083611228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4290250000 + 3930913809 = 65500^2 + 62697^2 .

It is a cyclic number.

It is not a de Polignac number, because 8221163809 - 2³ = 8221163801 is a prime.

It is a super-2 number, since 2×8221163809² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8221163801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110581904 + 4110581905.

It is an arithmetic number, because the mean of its divisors is an integer number (4110581905).

Almost surely, 2^8221163809 is an apocalyptic number.

It is an amenable number.

8221163809 is a deficient number, since it is larger than the sum of its proper divisors (1).

8221163809 is an equidigital number, since it uses as much as digits as its factorization.

8221163809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 8221163809 is about 90670.6336638275. The cubic root of 8221163809 is about 2018.2630404738.

The spelling of 8221163809 in words is "eight billion, two hundred twenty-one million, one hundred sixty-three thousand, eight hundred nine".