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661

660 ← 661 → 662
읽는 법육백육십일
세는 법육백예순하나
한자六百六十一
소인수 분해소수
로마 숫자DCLXI
2진수10100101012
3진수2201113
4진수221114
5진수101215
6진수30216
8진수12258
12진수47112
16진수29516
20진수1D120
36진수ID36
φ(661)660
σ*(661)662
d(661)2
σ(661)662
μ(661)-1
M(661)-12
수 목록 · 정수

661(육백육십일)은 660보다 크고 662보다 작은 자연수이다.

수학

[편집]
  • 121번째 소수이다. 앞의 소수는 659이고, 다음은 673이다.

과학

[편집]
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기타

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661
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