18316833389 has 2 divisors, whose sum is σ = 18316833390. Its totient is φ = 18316833388.

The previous prime is 18316833343. The next prime is 18316833433. The reversal of 18316833389 is 98333861381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16465252489 + 1851580900 = 128317^2 + 43030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18316833389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18316833389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18316833319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158416694 + 9158416695.

It is an arithmetic number, because the mean of its divisors is an integer number (9158416695).

Almost surely, 2^18316833389 is an apocalyptic number.

It is an amenable number.

18316833389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18316833389 is an equidigital number, since it uses as much as digits as its factorization.

18316833389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 53.

The spelling of 18316833389 in words is "eighteen billion, three hundred sixteen million, eight hundred thirty-three thousand, three hundred eighty-nine".