You write "49", then you either add 9 or 12 zeros, depending on whether you prefer the "short scale" or the "long scale". English-speaking countries would usually add 9 zeros (short scale).
100,000,000,000
6,700,000,000
233,700,000,000
9,000,000,000,000
1,180,000,000
2200000000
13,000,000,000
$3,000,000,000
As a number it is: 1,200,000,000
As a number: 1,000,000,000 = one billion
1 billion = 1000000000 1 million = 1000000 So a million billion is 1000000000000000
4,902,000,000 which happens to be 4.902 billion. Did you word that correctly?