7.55 × 109 = 822.95 is a lot smaller than 75,500,000,000
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109 is a prime number.
I think you mean 109,999. in that case, the number after it is 110,000
Restate the question: What unit is 10-9 of a meter?A nanometer (nm)
109 is prime.
The next prime number after 108 is 109.