If you look closely, there is a small hexagon just above the input box. @De_inordinatio already found it, but doesn't seem to have figured out the answer yet either.
As you may imagine, I'm a bit hesitant to give any additional hints, since that would kind of go against the point of the game, but I'll try and nudge you in the right direction.
You are on the right path with converting things to numbers, but keep in mind that the answer is only 6 characters long.
(If you look closer at the input field you might even see the answer.)