1,000,000,000,000,000,000
and
The global population is
6,730,609,019
We can estimate there are 148,574,965.09 insects per human.
Hope that helps,
Ash
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10,000,000,000,000,000,000 insects (one extra zero) http://www.si.edu/Encyclopedia_SI/nmnh/buginfo/bugnos.htm
and for a current estimate of world population http://www.census.gov/ipc/www/popclockworld.html
based upon the accuracy of the available measurements, we can say that there are between 150 million and 1.5 billion insects for every man, woman, and child.
-TeeGeeRoo
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