8643658643 has 2 divisors, whose sum is σ = 8643658644. Its totient is φ = 8643658642.

The previous prime is 8643658627. The next prime is 8643658649. The reversal of 8643658643 is 3468563468.

8643658643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8643658643 - 2⁴ = 8643658627 is a prime.

It is not a weakly prime, because it can be changed into another prime (8643658649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321829321 + 4321829322.

It is an arithmetic number, because the mean of its divisors is an integer number (4321829322).

Almost surely, 2^8643658643 is an apocalyptic number.

8643658643 is a deficient number, since it is larger than the sum of its proper divisors (1).

8643658643 is an equidigital number, since it uses as much as digits as its factorization.

8643658643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 53.

The square root of 8643658643 is about 92971.2785918318. The cubic root of 8643658643 is about 2052.2607336354.

The spelling of 8643658643 in words is "eight billion, six hundred forty-three million, six hundred fifty-eight thousand, six hundred forty-three".