In Robert Heinlein's "The Number of the Beast" there are exactly (6 ^ 6) ^ 6 alternate universes (including ours).
This totals 10,314,424,798,490,535,546,171,949,056 universes, or 10 octillion, 314 septillion, 424 sextillion, 798 quintillion, 490 quadrillion, 535 trillion, 546 billion, 171 million, 949 thousand and 56.
They're accessed by rotating 90 degrees or more from the x, y and z axes (plural of "axis") in our three dimensional universe. The device which causes this rotation does not use power (although power is used to configure the device for the desired destination).
Viewers watching an object move from the current dimension to another will see the object rotate away from them even if multiple viewers observe the rotation from different angles.
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