Apocalyptri numbers are numbers of the form 3n containing the digits 666 in their decimal expansions.[1]
The smallest apocalyptri number is \(3^{34}\). The decimal expansion of it is 16,677,181,699,666,569.
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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