octillion

number2

1. •
   A thousand trillion trillion, a billion billion billion: 1 followed by 27 zeros, 10²⁷.

   • Altogether it takes seven billion billion billion (that’s 7,000,000,000,000,000,000,000,000,000, or seven octillion) atoms to make you. — 2019
2. •
   (UK, old-fashioned) A trillion quintillion: 1 followed by 48 zeros, 10⁴⁸.