8638666579 has 2 divisors, whose sum is σ = 8638666580. Its totient is φ = 8638666578.

The previous prime is 8638666571. The next prime is 8638666591. The reversal of 8638666579 is 9756668368.

8638666579 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8638666579 - 2³ = 8638666571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8638666579.

It is not a weakly prime, because it can be changed into another prime (8638666571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4319333289 + 4319333290.

It is an arithmetic number, because the mean of its divisors is an integer number (4319333290).

Almost surely, 2^8638666579 is an apocalyptic number.

8638666579 is a deficient number, since it is larger than the sum of its proper divisors (1).

8638666579 is an equidigital number, since it uses as much as digits as its factorization.

8638666579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 64.

The square root of 8638666579 is about 92944.4273692619. The cubic root of 8638666579 is about 2051.8655695702.

The spelling of 8638666579 in words is "eight billion, six hundred thirty-eight million, six hundred sixty-six thousand, five hundred seventy-nine".