How To Write Three Billion, Sixty Million, Sixty-six Thousand, Nine Hundred In Standard Form?

3,60,066,0900

3,060,066,900

3 060 066 900
or in another expanded form:
3 000 000 000+ 60 000 000+ 60 000+ 6 000+ 900

I don't really know how to write this number so I'm asking

3,060,066,900

Sixty thousand five hundred

3,060,066,900