18332911217 has 2 divisors, whose sum is σ = 18332911218. Its totient is φ = 18332911216.

The previous prime is 18332911213. The next prime is 18332911229. The reversal of 18332911217 is 71211923381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17403941776 + 928969441 = 131924^2 + 30479^2 .

It is a cyclic number.

It is not a de Polignac number, because 18332911217 - 2² = 18332911213 is a prime.

It is not a weakly prime, because it can be changed into another prime (18332911213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9166455608 + 9166455609.

It is an arithmetic number, because the mean of its divisors is an integer number (9166455609).

Almost surely, 2^18332911217 is an apocalyptic number.

It is an amenable number.

18332911217 is a deficient number, since it is larger than the sum of its proper divisors (1).

18332911217 is an equidigital number, since it uses as much as digits as its factorization.

18332911217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The spelling of 18332911217 in words is "eighteen billion, three hundred thirty-two million, nine hundred eleven thousand, two hundred seventeen".