1 / ((360 x 0.000291) / 2) =

$${\frac{{\mathtt{1}}}{\left({\frac{\left({\mathtt{360}}{\mathtt{\,\times\,}}{\mathtt{0.000\: \!291}}\right)}{{\mathtt{2}}}}\right)}} = {\mathtt{19.091\: \!256\: \!204\: \!658\: \!266\: \!5}}$$

.