For those of us living lives surrounded by technology, having to remember strings of digits has become endemic to our way of life. The big problem is that numbers aren’t very mnemonic, so those of us cursed with less than eidetic memory must haul around a (laptop|handheld|pile of Post-It notes|filing cabinet) full of scribbled numbers to get by.
Allan Krill proposes a system of phonetic numerals that replace purely mathematical number symbols with pronounceable phonetic symbols. I’m not sure I find his system entirely usable, but the theory of using sounds, which are much easier for most people to remember than abstract numerals, isn’t a bad idea.