6, 12, 18, etc.... Just add 6 at a time until you reach the stated limit.
The number 156 is "one hundred fifty-six."
Seven hundred sixty-one thousand, six hundred six Or, seven six one six zero six ;-)
20,000,601 is the number 'twenty million six hundred and one'
One hundred five million one hundred eighty thousand three hundred forty-six
six hundred fifty-one billion one hundred forty-nine million one hundred seventy-seven thousand six hundred nineteen
1,000,600 is one million, six hundred.
Three million, one hundred twenty-six thousand, one hundred
0.02031671196 = two billion, thirty-one million, six hundred seventy-one thousand, one hundred ninety-six hundred-billionths.
One hundred thirty thousand, six hundred.
105,600
One hundred six thousand, seven hundred eighty-four.
Three and one hundred forty-six thousand six hundred twenty-six millionths.