As a number it is: 24,600,000,000 = 24.6 billion
19.35 billion = 19,350,000,000
As a number: 7,125,000,000 = 7.125 billion
As a number it is: 1,800,000,000 = 1.8 billion
To write one billion three million, you would write out the number 1,003,000,000.
15,000,000,000
Since you asked how I would write the number, the answer is 1031.
As a number it is: 6,080,000,000 = 6.08 billion
As a number it is: 529,600,000,000 = 529.6 billion
As a number it is 12,800,000,000 = 12.8 billion
As a number it is: 24,600,000,000 = 24.6 billion
19.35 billion = 19,350,000,000
As a number: 7,125,000,000 = 7.125 billion
As a number it is: 1,800,000,000 = 1.8 billion
15,000,000,000
15,000,027
80 billion = 80,000,000,000