# Divisors of the Positive Integer 661

1, 661## Sum of all the Divisors of 661, including itself

662## Sum of the Proper Divisors of 661

1## Properties of the number 661

The integer 661 is an**odd**number.

The integer 661 is a

**Prime**number.

1 is

*less than*661, so 661 is a

**deficient**number.

## The number 661 as a Roman Numeral

**DCLXI**

## The number 661 in various Numeral Systems

Base |
Representation |
---|---|

2: | 1010010101 |

3: | 220111 |

4: | 22111 |

5: | 10121 |

6: | 3021 |

7: | 1633 |

8: | 1225 |

9: | 814 |

10: | 661 |

11: | 551 |

12: | 471 |

13: | 3BB |

14: | 353 |

15: | 2E1 |

16: | 295 |

17: | 24F |

18: | 20D |

19: | 1FF |

20: | 1D1 |

21: | 1AA |

22: | 181 |

23: | 15H |

24: | 13D |

25: | 11B |

26: | PB |

27: | OD |

28: | NH |

29: | MN |

30: | M1 |

31: | LA |

32: | KL |

33: | K1 |

34: | JF |

35: | IV |

36: | ID |