 The number of grains is the 64th Mersenne number.In technology strategy, the "second half of the chessboard" is a phrase, coined by Ray Kurzweil, in reference to the point where an exponentially growing factor begins to have a significant economic impact on an organization's overall business strategy.While the number of grains on the first half of the chessboard is large, the amount on the second half is vastly (232 > 4 billion times) larger.