let formatter = Intl.NumberFormat('en', {
  notation: 'compact',
  style: 'currency',
  currency: 'SGD',
});

let n = formatter.format(505123);

console.log(n); //SGD 505K

let formatter = Intl.NumberFormat('en', {
  notation: 'compact',
});

let n = formatter.format(155123123123);

console.log(n); //1.6T