18333670217 has 2 divisors, whose sum is σ = 18333670218. Its totient is φ = 18333670216.

The previous prime is 18333670151. The next prime is 18333670241. The reversal of 18333670217 is 71207633381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18016082176 + 317588041 = 134224^2 + 17821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18333670217 is a prime.

It is a super-2 number, since 2×18333670217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18333670517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9166835108 + 9166835109.

It is an arithmetic number, because the mean of its divisors is an integer number (9166835109).

Almost surely, 2^18333670217 is an apocalyptic number.

It is an amenable number.

18333670217 is a deficient number, since it is larger than the sum of its proper divisors (1).

18333670217 is an equidigital number, since it uses as much as digits as its factorization.

18333670217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 18333670217 in words is "eighteen billion, three hundred thirty-three million, six hundred seventy thousand, two hundred seventeen".