UNDECILLION

[un.de.cil.lion] n, often attrib [L undecim eleven (fr. unus one + decem ten) + E -illion (as in million)--more at one, ten] (1931): the figure 1 followed by 36 zeroes: the figure 1,000 followed by 11 groups of three zeroes; also, Brit: the figure 1 followed by 66 zeroes: one million to the 11th power