Number of combinations in Rubik's Revenge

There are 7,401,196,841,564,901,869,874,093,974,498,574,336,000,000,000 combinations in the Rubik's revenge, logical successor to the Rubik's cube, (pictured to the right). The 4x4x4 Rubik's cube has exactly 171,118,012,606,138,569,596,625,000 times more combinations that the 3x3x3.