quadrillion

The cardinal number equal to 10¹⁵.

The cardinal number equal to 10²⁴.

The fourth power of a million according to the system of numeration called English; but the fifth power of a thousand according to the French system, commonly used in the United States.

The cardinal numeral obtained from a quadrillion: used like hundred.

According to the French notation, which is followed also upon the Continent and in the United States, a unit with fifteen ciphers annexed; according to the English notation, the number produced by involving a million to the fourth power, or the number represented by a unit with twenty-four ciphers annexed. See the Note under numeration.

A thousand trillion: 1 followed by fifteen zeros, 1015.

A million trillion: 1 followed by twenty-four zeros, 1024.

Any very large number, exceeding normal description.

the number that is represented as a one followed by 15 zeros

the number that is represented as a one followed by 24 zeros