Board Thread:Questions and Answers/@comment-23967103-20141019225503/@comment-24577221-20141020000252

It was discussed here. Your actual number of coins will continue to go up, probably to a much higher value, but for some reason the highest value the game will display is 1,999,999,999.

Are you playing the Windows version or one of the others? I play the Windows version, and I've been wondering if the same behaviour was built into the mobile-app version.