A dollar is a currency of a large number of countries: in most cases the value differing from one country to another. You have not specified which country. In any case, billion (by itself) are a pure number which have no monetary value.
A billion billion.
1000 billions are in a trillion.
3550
There are one thousand billions in one trillion.
A thousand of them.
Twelve zeros.
1.375 billion
100000000000 trilion
A trillion = a million millions.
One thousand.
All you want.
1,000000