[brlewis]

One might also choose not to bring in a BigNum library if you don't need to find every anagram. Here's an exhaustive list of anagrams I found with sorting and comparing that a quick Fundamental Theorem implementation missed:

   [ 'basiparachromatin', 'Marsipobranchiata' ]
   [ 'configurationism', 'misconfiguration' ]
   [ 'constructionism', 'misconstruction' ]
   [ 'pericardiacophrenic', 'phrenicopericardiac' ]
   [ 'anatomicophysiologic', 'physiologicoanatomic' ]
   [ 'petrographically', 'pterylographical' ]

[brlewis]

Note this is out of 20K anagrams.

Here's my code: https://github.com/brlewis/brlewis.github.io/blob/master/201...

On my machine, Fundamental Theorem of Arithmetic finished in 1.703 seconds, sorting letters in 1.954 seconds.