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
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".
Nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine
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.
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.
Three hundred thirty six million two hundred ninety thousand six hundred ninety nine.