18133813349 has 2 divisors, whose sum is σ = 18133813350. Its totient is φ = 18133813348.

The previous prime is 18133813333. The next prime is 18133813381. The reversal of 18133813349 is 94331833181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13788630625 + 4345182724 = 117425^2 + 65918^2 .

It is an emirp because it is prime and its reverse (94331833181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18133813349 - 2⁴ = 18133813333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18133813309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9066906674 + 9066906675.

It is an arithmetic number, because the mean of its divisors is an integer number (9066906675).

Almost surely, 2^18133813349 is an apocalyptic number.

It is an amenable number.

18133813349 is a deficient number, since it is larger than the sum of its proper divisors (1).

18133813349 is an equidigital number, since it uses as much as digits as its factorization.

18133813349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The spelling of 18133813349 in words is "eighteen billion, one hundred thirty-three million, eight hundred thirteen thousand, three hundred forty-nine".