Apparently, Butters' birthday is one day after mine. Also, I'm nowhere near as gullible as him.
But, some similarities (all from wikipedia):
Butters is occasionally shown to have a savant-like grasp of mathematics, quickly adding and multiplying huge numbers at other's behest. Despite his usual naiveté, Butters has shown wisdom beyond his years. Butters is unfortunately responsible for the deaths of at least 17 people