billionth is 1,000,000,000 millionth is 1000000
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One billionth of one millionth in the US is 1 x 10-15. In the UK it is 1 x 10-18.
T U Th H TTh M B Tb
A thousand. The prefix "micro" means 10-6 (a millionth), while the prefix "nano" means 10-9 (a billionth).
1 nanometer = 1/1,000,000 mm which is one one-millionth of a millimeter or one one-billionth of a meter.
One millionth of a second is called a microsecond (as can be found at College and Graduate School of Arts and Sciences, Boston University http://www.cs.bu.edu/faculty/snyder/cs210/Units.htm). There is some conjecture that the correct answer to this question could also be a billisecond (in that in Imperial Measure milli means one thousandth and billi means one millionth).