One hundred and twenty five thousand billion is not a number. You can either put million or thousands.
1,005,520,028
Three billion, five hundred fifty-two million, three hundred eight thousand, seven hundred twenty-five
3,552,308,725 = three billion, five hundred fifty-two million, three hundred eight thousand, seven hundred twenty-five.
Five hundred and twenty one billions or billion In scientific notation it is: 5.21*1011
three billion one hundred twenty five million one hundred thousand
six billion five hundred six million thirteen thosand four hundred twenty
5,920,000,222
521,000,000,000 = five hundred twenty-one billion.
three billion, nine hundred twenty-five million, twelve thousand, three hundred twenty-nine and twenty-four hundredths.
Fifty-two billion, five hundred twenty thousand.
5,026,501,002
seventy-eight billion, four hundred and twenty-one million, five hundred and twenty thousand