8563663643 has 2 divisors, whose sum is σ = 8563663644. Its totient is φ = 8563663642.

The previous prime is 8563663637. The next prime is 8563663699. The reversal of 8563663643 is 3463663658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8563663643 - 2²² = 8559469339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8563663591 and 8563663600.

It is not a weakly prime, because it can be changed into another prime (8563663613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4281831821 + 4281831822.

It is an arithmetic number, because the mean of its divisors is an integer number (4281831822).

Almost surely, 2^8563663643 is an apocalyptic number.

8563663643 is a deficient number, since it is larger than the sum of its proper divisors (1).

8563663643 is an equidigital number, since it uses as much as digits as its factorization.

8563663643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 50.

The square root of 8563663643 is about 92540.0650691364. The cubic root of 8563663643 is about 2045.9100405028.

The spelling of 8563663643 in words is "eight billion, five hundred sixty-three million, six hundred sixty-three thousand, six hundred forty-three".