A number of the form 
that contains the digits 666 (i.e., the beast
number) is called an apocalyptic number. 
is an apocalyptic number. The first few such powers
are 157, 192, 218, 220, ... (OEIS A007356).
Apocalyptic Number
See also
Apocalypse Number, Beast Number, Legion's Numbers, Leviathan NumberExplore with Wolfram|Alpha
References
Pickover, C. A. Keys to Infinity. New York: Wiley, pp. 97-102, 1995.Sloane, N. J. A. Sequence A007356/M5405 in "The On-Line Encyclopedia of Integer Sequences."Sloane, N. J. A. and Plouffe, S. Figure M5405 in The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.Referenced on Wolfram|Alpha
Apocalyptic NumberCite this as:
Weisstein, Eric W. "Apocalyptic Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ApocalypticNumber.html