It means one billion multiplied by itself 18 times. The result of 1 billion to the 18th power, in scientific notation, is 1.0e162 or 1.0 x 10162
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Assuming you mean billion*billion*billion = It is 1*10^27.
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If by billion you mean an American billion (109), 1,900,000,000. If you mean a British billion (1012), put 3 more 0s on to the end.
A billion.