000000001 is the same as 1!
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That loopks like a micrometer ... 0.001 millimeter.
You add it to the beginning of a unit, such as nanosecond. It means a factor of !0^-9 of the unit. So a nanosecond would be 10^-9 of a second or .000000001 of a second.
101 is the smallest 3 digit Prime number.
One nanometer is equivalent to .000000001 meters (1 x 10^-9 m). Therefore 650 nanometers equals .00000065 meters or 6.5 x 10^-7 meters.
The base makes no difference. The symbol 1, by itself or with leading zeroes, is always regarded as being the number one. Note that 1 is not a number. One (the word) is a number while 1 is merely the symbolic representation for the number we call one. But 01 is also one, as is 000000001. The leading zeroes are simply ignored.