55

← 54

56 →

数表 — 整数

<< 50 51 52 53 54 55 56 57 58 59 >>

命名

小寫

五十五

大寫

伍拾伍

序數詞

第五十五
fifty-fifth

識別

種類

整數

性質

質因數分解

5\times 11

表示方式

ΝΕ´

𒐐𒐙

110111₍₂₎

2001₍₃₎

313₍₄₎

210₍₅₎

67₍₈₎

47₍₁₂₎

37₍₁₆₎

55（五十五）是54与56之间的自然数。

数学性质

第38個合數，正因數有1、5、11和55。前一個為54、下一個為56。
質因數分解為 $5\times 11$ 。
第43個虧數，真因數和為17，虧度為38。前一個為53、下一個為57。
第36個不尋常數，大於平方根的質因數為11。前一個為53、下一個為57。
第19個半質數。前一個為51、下一個為57。
第34個無平方數因數的數。前一個為53、下一個為57。
第10個斐波那契數。前一個為34、下一個為89。
第28個十进制的奢侈數。前一個為54、下一個為56。
- 斐波那契數列中最大的三角形數。
首5個平方數之和： ${{{{{{1}^{2}}+{{2}^{2}}}+{{3}^{2}}}+{{4}^{2}}}+{{5}^{2}}}=55$
首10個自然數之和： ${{{{{{{{{{1}+{2}}+{3}}+{4}}+{5}}+{6}}+{7}}+{8}}+{9}}+{10}}=55$
第5個七邊形數、第10個三角形數、第4個中心九邊形數。
卡布列克數
迴文數

基本运算

乘法	1	2	3	4	5	6	7	8	9	10		11	12	13	14	15	16	17	18	19	20		21	22	23	24	25
${{55}\times {x}}$	55	110	165	220	275	330	385	440	495	550		605	660	715	770	825	880	935	990	1045	1100		1155	1210	1265	1320	1375

在科学中

銫的原子序數^[1]

在其它领域中

巴西的國際電話區號

参考文献

^ Royal Society of Chemistry - Visual Element Periodic Table. [2012-11-23]. （原始内容存档于2016-04-10）.

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