69
69是68搭70之间个自然数。
- 第49个合数，正约数有1、3、23搭69。前一个为68、下一个为70。
- 第46个不寻常数，大于平方根个素因数为23。前一个为68、下一个为71。
- 第24个半素数。前一个为65、下一个为74。
- 铥个原子序数。
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