8318618389 has 2 divisors, whose sum is σ = 8318618390. Its totient is φ = 8318618388.

The previous prime is 8318618387. The next prime is 8318618417. The reversal of 8318618389 is 9838168138.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8141994289 + 176624100 = 90233^2 + 13290^2 .

It is a cyclic number.

It is not a de Polignac number, because 8318618389 - 2¹ = 8318618387 is a prime.

Together with 8318618387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8318618383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4159309194 + 4159309195.

It is an arithmetic number, because the mean of its divisors is an integer number (4159309195).

Almost surely, 2^8318618389 is an apocalyptic number.

It is an amenable number.

8318618389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8318618389 is an equidigital number, since it uses as much as digits as its factorization.

8318618389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1990656, while the sum is 55.

The square root of 8318618389 is about 91206.4602372003. The cubic root of 8318618389 is about 2026.2066385965.

The spelling of 8318618389 in words is "eight billion, three hundred eighteen million, six hundred eighteen thousand, three hundred eighty-nine".