Don't leave just yet. ;) This isn't uniquely impossible for just Perl. But the problem you're trying to solve may be within reach of many languages and architectures. So what problem are you trying to solve?

Perhaps we've got a communications breakdown. Is it possible you're asking if you're able to store values as high as 10^18 in an array? If that's what you want, yes, and you can do so using Math::BigInt (or other Big* modules).