Okay to answer your question the max value is as follows The number 2,147,483,647 (or hexadecimal 7FFF,FFFF16) is the maximum positive value for a 32-bit signed binary integer in computing.
According to google.
I ran the numbers at 9,999,999,999 and got that number. Warning though, and AGI over 100k and you teleport across the entire map instantly and can kill yourself. Also, entering the 2 billion+ number results in negative health, and money, due to the + to health you get with level up and max skills. 699 is max weapon skill, and 10 is the max skill level. Honestly though anything above 500 STR, you don't gain damage, you only gain health. And having max hexagonal charisma with skill bonuses, leads to negative army numbers as well. I would upload photos, but it's not letting me do that on my browser for some reason. any way, that should answer the question. At what the max is you gain any benefits, that will vary, but max of anything is the above hexagonal value from google.