8356664647 has 2 divisors, whose sum is σ = 8356664648. Its totient is φ = 8356664646.

The previous prime is 8356664639. The next prime is 8356664717. The reversal of 8356664647 is 7464666538.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8356664647 - 2³ = 8356664639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8356664627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4178332323 + 4178332324.

It is an arithmetic number, because the mean of its divisors is an integer number (4178332324).

Almost surely, 2^8356664647 is an apocalyptic number.

8356664647 is a deficient number, since it is larger than the sum of its proper divisors (1).

8356664647 is an equidigital number, since it uses as much as digits as its factorization.

8356664647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 55.

The square root of 8356664647 is about 91414.7944645723. The cubic root of 8356664647 is about 2029.2909789809.

The spelling of 8356664647 in words is "eight billion, three hundred fifty-six million, six hundred sixty-four thousand, six hundred forty-seven".