"Die Mathematik ist die Königin der Wissenschaften und die Zahlentheorie ist die Königin der Mathematik." -- German mathematician and physicist Carl Friedrich Gauss (b. 1777-04-30, d. 1855-02-23)
"Mathematics is the queen of the sciences and number theory is the queen of mathematics." [Wikiquote, where I found this in both languages, also gives a longer version which concludes, "She often condescends to render service to astronomy and other natural sciences, but in all relations she is entitled to the first rank."]