gorge/numbers.js

function render(val, places = 1, smallPlaces = 0) {
  return numberText(val, places, smallPlaces);
}

function numberText(val, places = 1, smallPlaces = 0) {
  if (val < 1000) {
    return round(val, smallPlaces);
  }

  let power = Math.floor(Math.log10(val));

  let order = Math.floor(power / 3);

  adjusted = round(val / Math.pow(1000, order), places).toFixed(places);

  if (order <= 21)
    return adjusted + " " + _numberWords[order - 1];
  else
    return numberText(val / Math.pow(10, 63), places, smallPlaces) + " vigintillion"
}

_numberWords = {
  0: "thousand",
  1: "million",
  2: "billion",
  3: "trillion",
  4: "quadrillion",
  5: "quintillion",
  6: "sextillion",
  7: "septillion",
  8: "octillion",
  9: "nonillion",
  10: "decillion",
  11: "undecillion",
  12: "duodecillion",
  13: "tredecillion",
  14: "quattuordecillion",
  15: "quindecillion",
  16: "sexdecillion",
  17: "septendecillion",
  18: "octodecillion",
  19: "novemdecillion",
  20: "vigintillion",
}