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170 (one hundred () seventy) is the natural number following 169 and preceding 171. ==In mathematics== 170 is the smallest ''n'' for which φ(''n'') and σ(''n'') are both square(64 and 324 respectively). But 170 is never a solution for φ(''x''), making it a nontotient. Nor is it ever a solution to ''x'' - φ(''x''), making it a noncototient. 170 is a repdigit in base 4 (2222) and base 16 (AA), as well as in bases 33, 84, and 169. It is also a sphenic number. 170 is the largest integer for which its factorial can be stored in double-precision floating-point format. This is probably why it is also the largest factorial that Google's built-in calculator will calculate, returning the answer as 170! = 7.25741562 × 10306. There are 170 different cyclic Gilbreath permutations on 12 elements, and therefore there are 170 different real periodic points of order 12 on the Mandelbrot set.〔.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「170 (number)」の詳細全文を読む スポンサード リンク
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