SEXDECILLION

[sex.de.cil.lion] n, often attrib [L sedecim, sexdecim sixteen (fr. sex six + decem ten) + E -illion (as in million)--more at ten] (ca. 1934): the figure 1 followed by 51 zeroes: the figure 1,000 followed by 16 groups of three zeroes; also, Brit: the figure 1 followed by 96 zeroes: one million to the 96th power