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  1. Split the number into blocks of three digits each from the right hand end (the last bock on the left may have less than three digits in it).
  2. Read each block of three digits from the left hand end in terms of hundreds-tens-units and follow it by the appropriate multiplier ([none], "thousand", "million", etc)

423090709000 -> 423 090 709 000

Using the short scale, the multipliers (from the right hand end) are [none], "thousand", "million", "billion", "trillion", etc, so the number is:

Four hundred and twenty three billion, ninety million, seven hundred and nine thousand.

Using the long scale, the multipliers are [none], "thousand", "million", "thousand million" (or "milliard"), "billion", etc, so the number is:

Four hundred and twenty three thousand million, ninety million, seven hundred and nine thousand.

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