55 (number)

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Fifty-five is the natural number after 54 and before 56. It is a composite number with factors 5 and 11, so its divisors are 1, 5, 11, and 55. It is also a Fibonacci number. In different bases, it is written as: binary 110111 (base 2); ternary 1021 (base 3); senary 131 (base 6); octal 67 (base 8); duodecimal 47 (base 12); hexadecimal 37 (base 16). In Roman numerals it is LV, and in Greek numerals ΝΕ´. The ordinal form is 55th (fifty-fifth).