Apocalyhexakosioihexekontahexa numbers are numbers of the form 666n such that the number 666 appears somewhere within the complete decimal expansion of that number.[1]
6661 is obviously the first apocalyhexakosioihexekontahexa number, though 66625 is the first non-trivial apocalyhexakosioihexekontahexa number. It is equal to 38,623,864,893,695,003,134,933,028,077,453,365,661,807,146,681,545,105,139,529,066,664,165,376.
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Specific numbers: Beast number · Belphegor's prime · Legion's number of the first kind · Super-leviathan · Legion's number of the second kind · Leviathan number
Forms of numbers: apocalypse number · apocalyptic number · apocalyptri number · apocalyptetra number · apocalypenta number · apocalyhexakosioihexekontahexa number · Goliath number