Why God made powers of 2

Daniel Tammett is an autistic savant 'whose brain somehow possesses an island of brilliance.' He appears to be unique as 'the first recorded savant to have no easily recognizable autism' and in that he can describe how he performs his feats of memory. Here is a decent video about him, but what will stay with me longer than the clip of Daniel reciting the first 22,514 digits of pi was the short segment titled 'Bullied'.