quadrilliard number1 •(rare) A thousand million million million million: 1 followed by twenty-seven zeros, 10²⁷.Ugh. An Australian should use Australian numbers (the same as British), not American. 10^27 is 1,000 quadrillion (or a quadrilliard). An octillion would be 10^48. — 2002 formsquadrilliards
