The SI nano- prefix means x 10-9
There is no such thing as "opposite". "Nano" is simply a prefix, meaning 10 to the power -9.
nano
nano-
'Nano' is not a noun; 'nano' is not even a word, it is a prefix meaning 'one billionth' or used informally as an extremely small part of a whole. Some words with the prefix nano- are nanosecond, nanotechnology, or nanoscale.
nano-
Nano.
micro- nano-
Nano- means million.
The prefix "nano" = 1/1,000,000,000 indicates 10^-9 or a billionth.
0.000000001
The prefix for 10-9 is nano-.