Looking at the docs of Math::BigInt, this should do it:

perl -MMath::BigInt=:constant -e "print 123**17"
[download]

Which is the same thing as:

use Math::BigInt ':constant';
print 123**17;
[download]

Hope that helps. :)

---

You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.