10010...86523 (28-digits)

This number is a prime.

                                              10010000 0000100000 1001086523

The smallest prime that has all the letters used to spell integers (23) in English, short-scale system, except the impossible "Z" in any numeral greater than zero: ONE oCTILlion one SePtillion one QUADRillion one Billion one Million eiGHtY-siX thousand FiVe hundred tWenty-three (ONECT ILSPQ UADRB MGHYX FVW). [Rivera]