quintillion

The cardinal number equal to 10¹⁸.

The cardinal number equal to 10³⁰.

In the English notation, the fifth power of a million, a unit followed by thirty ciphers; in the French notation, used generally in the United States, the sixth power of one thousand, a unit followed by eighteen ciphers.

Noting a quintillion; the cardinal numeral corresponding to a quintillion: strictly a collective noun. See hundred, a.

A billion billion: 1 followed by eighteen zeros, 1018.

A million quadrillion: 1 followed by 30 zeros, 1030.

Any very large number, exceeding normal description.

the number that is represented as a one followed by 18 zeros