TREDECILLION

[tre.de.cil.lion] n, often attrib [L tredecim thirteen (fr. tres three + decem ten) + E -illion (as in million)--more at three, ten] (ca. 1934): the figure 1 followed by 42 zeroes: the figure 1,000 followed by 13 groups of three zeroes; also, Brit}: the figure 1 followed by 78 zeroes: one million to the 13th power