55 fiveA few steps from Spanish Steps, in the heart of Rome, Hotel 55 is a relaxing oasis for a couple escape, a family vacation or a business visit in Rome at55 is a square pyramidal number. 55 is: . the 10th Fibonacci number [1] and the 10th triangular number, [2] The sum of 55's dits is also 10.; the 5th heptagonal number, [3] the 5th square