Dmitri Donskoy. IIRC it was the first of the class and is/was being used for testing the Bulava SLBM.
There were rumors that a couple of the other Typhoons would be refitted as SSGNs along the lines of the older Ohios, but the Russkies gave up on it as not cost effective. The Typhoons are old and it would take many rubles to modernize them.