Those of you that have picked up New Super Mario Bros. 2 have probably also enabled SpotPass, which will be used to contribute your haul to the world coin total. We'd also assume that Nintendo will send regular updates so we can all see how ludicrously high that total gets.
While there haven't been any updates as yet in the UK or North America, understandable as the game hasn't even been available for a week, an update has been sent to Japanese systems; the total is enough to make even Wario blush.
As you can see in the screengrab above, kindly provided by Nintendaan, a recent update gives a figure of 36,411,918,144, or just under 36.5 billion. There's some speculation around the web that over 30 billion of these have been collected in Japan, but gamers in Nintendo's homeland have had a three week head start.
We'd expect Western updates soon, and we'll see just how high the total can go.