you can't!!
Ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine.
The following number would be 10,000,000, or 10 million.
1 billion
Unfortunately, sillion is not a number. 390,000,000 is three hundred ninety million. 390,000,000,000 is three hundred ninety billion. 390,000,000,000,000 is three hundred ninety trillion.
Long billion (=1012): Nine billion, nine hundred and ninety nine thousand million, nine hundred and ninety nine million, nine hundred and ninety nine thousand, nine hundred and ninety nine. Alternatively: Nine billion, nine hundred and ninety nine milliard, nine hundred and ninety nine million, nine hundred and ninety nine thousand, nine hundred and ninety nine. Short billion (=109): Nine trillion, nine hundred and ninety nine billion, nine hundred and ninety nine million, nine hundred and ninety nine thousand, nine hundred and ninety nine.
4,216,000,090
1,300,098,218
Nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine
If you're counting down, then the next integer (whole number) is "a hundred million nine hundred ninety-nine thousand nine hundred ninety-eight". If you're counting up, then the next integer is "two hundred million".
Eight million, nine hundred and ninety-nine thousand, nine hundred and ninety-eight in numerals is: 8,999,998
Ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine.
The following number would be 10,000,000, or 10 million.
1 billion
Unfortunately, sillion is not a number. 390,000,000 is three hundred ninety million. 390,000,000,000 is three hundred ninety billion. 390,000,000,000,000 is three hundred ninety trillion.
One trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight.
Three hundred thirty six million two hundred ninety thousand six hundred ninety nine.
Long billion (=1012): Nine billion, nine hundred and ninety nine thousand million, nine hundred and ninety nine million, nine hundred and ninety nine thousand, nine hundred and ninety nine. Alternatively: Nine billion, nine hundred and ninety nine milliard, nine hundred and ninety nine million, nine hundred and ninety nine thousand, nine hundred and ninety nine. Short billion (=109): Nine trillion, nine hundred and ninety nine billion, nine hundred and ninety nine million, nine hundred and ninety nine thousand, nine hundred and ninety nine.