Fatto matematico: 11558 is an uninteresting number.
Trivia: 11558 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: August 23rd is the day in 2007 that the skeletal remains of Alexei Nikolaevich, Tsarevich of Russia, and his sister Anastasia are found near Yekaterinburg, Russia.