Google was born from a misspelling of «googol» (1 followed by 100 zeros), which itself was invented when a mathematician was playing with his nephew and together they came up with a name for really big numbers. (cnbc.com)
Which has the 1 chance in what is described as a googoplex, which is a googol which is a number that we can't imagine, raised to the googolth power. (religion.blogs.cnn.com)
But as Krauss notes, the various string theories exacerbate this problem because they allow for more than a googol (1 followed by 100 zeros) different possible universes with properties radically unlike our own. (discovermagazine.com)