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# 55 (number)

 ← 54 55 56 →
Cardinalfifty-five
Ordinal55th
(fifty-fifth)
Factorization5 × 11
Divisors1, 5, 11, 55
Greek numeralΝΕ´
Roman numeralLV
Binary1101112
Ternary20013
Quaternary3134
Quinary2105
Senary1316
Octal678
Duodecimal4712
Vigesimal2F20
Base 361J36

55 (fifty-five) is the natural number following 54 and preceding 56.

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## Mathematics

55 is the 10th Fibonacci number[1] and a triangular number (the sum of the consecutive numbers 1 to 10).[2] It is the largest Fibonacci number to also be a triangular number.

It is a square pyramidal number (the sum of the squares of the integers 1 to 5)[3] as well as a heptagonal number,[4] and a centered nonagonal number.[5]

In base 10, it is a Kaprekar number.[6]