| ||||
|---|---|---|---|---|
| Cardinal | fifty-five | |||
| Ordinal | 55th (fifty-fifth) | |||
| Factorization | 5 × 11 | |||
| Divisors | 1, 5, 11, 55 | |||
| Greek numeral | ΝΕ´ | |||
| Roman numeral | LV | |||
| Binary | 1101112 | |||
| Ternary | 20013 | |||
| Senary | 1316 | |||
| Octal | 678 | |||
| Duodecimal | 4712 | |||
| Hexadecimal | 3716 | |||
55 (fifty-five) is the natural number following 54 and preceding 56.
55 is the 10th Fibonacci number [1] and the 10th triangular number, [2] where 10 is the sum of 55's digits. It's the 5th heptagonal number, [3] the 5th square pyramidal number, [4] and the 4th centered nonagonal number. [5]
55 is also the 15th squarefree semiprime, [6] and the 19th semiprime, [7] as well as the 32nd nontotient number (including odd numbers > 1), [8] the 36th arithmetic number, [9] the 38th composite number [10] (where the abundance of 55 = - 38), [11] the 43rd deficient number, [12] the 45th trapezoidal number , [13] and the 49th polite number. [14]
21 (twenty-one) is the natural number following 20 and preceding 22.
26 (twenty-six) is the natural number following 25 and preceding 27.
38 (thirty-eight) is the natural number following 37 and preceding 39.
88 (eighty-eight) is the natural number following 87 and preceding 89.
82 (eighty-two) is the natural number following 81 and preceding 83.
85 (eighty-five) is the natural number following 84 and preceding 86.
89 (eighty-nine) is the natural number following 88 and preceding 90.
79 (seventy-nine) is the natural number following 78 and preceding 80.
74 (seventy-four) is the natural number following 73 and preceding 75.
34 (thirty-four) is the natural number following 33 and preceding 35.
39 (thirty-nine) is the natural number following 38 and preceding 40.
46 (forty-six) is the natural number following 45 and preceding 47.
52 (fifty-two) is the natural number following 51 and preceding 53.
56 (fifty-six) is the natural number following 55 and preceding 57.
57 (fifty-seven) is the natural number following 56 and preceding 58. It is a composite number.
65 (sixty-five) is the natural number following 64 and preceding 66.
66 (sixty-six) is the natural number following 65 and preceding 67.
67 (sixty-seven) is the natural number following 66 and preceding 68. It is an odd number.
91 (ninety-one) is the natural number following 90 and preceding 92.
55 may refer to: