the number that is represented as a one followed by 15 zeros the number that is represented as a one followed by 24 zeros; "in England they call a septillion a quadrillion
{i} 10 to the fifteenth power, 1 followed by 15 zeros (in U.S., Canada); 10 to the 24th power, 1 followed by 24 zeros (in Britain)
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
the number that is represented as a one followed by 24 zeros; "in England they call a septillion a quadrillion"