8318558993 has 2 divisors, whose sum is σ = 8318558994. Its totient is φ = 8318558992.

The previous prime is 8318558981. The next prime is 8318559001. The reversal of 8318558993 is 3998558138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5902541584 + 2416017409 = 76828^2 + 49153^2 .

It is a cyclic number.

It is not a de Polignac number, because 8318558993 - 2¹⁰ = 8318557969 is a prime.

It is not a weakly prime, because it can be changed into another prime (8318558903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4159279496 + 4159279497.

It is an arithmetic number, because the mean of its divisors is an integer number (4159279497).

Almost surely, 2^8318558993 is an apocalyptic number.

It is an amenable number.

8318558993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8318558993 is an equidigital number, since it uses as much as digits as its factorization.

8318558993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9331200, while the sum is 59.

The square root of 8318558993 is about 91206.1346237193. The cubic root of 8318558993 is about 2026.2018161268.

The spelling of 8318558993 in words is "eight billion, three hundred eighteen million, five hundred fifty-eight thousand, nine hundred ninety-three".