Apocalyptetra numbers are numbers of the form 4n containing the digits 666 in their decimal expansions.[1]
The smallest apocalytetra number is \(4^{96}\) :
6,277,101,735,386,680,763,835,789,423,207,666,416,102,355,444,464,034,512,896
Because all powers of 4 are also powers of 2, apocalyptetra numbers are a subset of the apocalyptic numbers.
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Specific numbers: Beast number · Belphegor's prime · Hyper-leviathan number · Legion's number of the first kind · Legion's number of the second kind · Leviathan number
Forms of numbers: apocalypse number · apocalyptic number · apocalyptri number · apocalyptetra number · apocalypenta number · apocalyhexakosioihexekontahexa number