Board Thread:New on My Singing Monsters Wiki/@comment-12783879-20140701011018/@comment-24577221-20140828222009

In fact, the maximum displayed value is 1,999,999,999. The actual value, stored internally, can be higher. If one collects coins beyond that limit, they "fly" away into the display at the top of the screen but the displayed value doesn't change. If one then spends coins (for example, to bake food), the displayed value stays the same until one's actual cash reserve drops below 1,999,999,999 coins.

Or at least that's how the Windows version works.

Curiouser and curiouser...