The presence and importance of hackers has been at the center of almost every great civilization. Zorba the Greek and Roger Bacon were good hackers. Hacking certainly antedates computing and might antedate mankind. I doubt that it is reasonable to put a specific number on the bit equivalent of human memory. If you want to discuss how many bits a person can recall then it might be easier, but remember, a lot of memorizers don't have full random access.
Memory is really strange stuff.
An acquaintance of mine is dyslexic, but has an eidetic memory and can remember several pages of a book and then struggle through reading them hours later. I do this with sounds. Often when I can't understand something I had just heard I find that repeating the sounds out loud will make the words understandable. The bill is currently in committee. A transcription of this bill, together with a news release and summary, can be found at the end of this message.