Number 661
The number 661 is the 121st prime number. It has 2 divisors and a digital root of 4. Explore its full properties below, or find words and phrases with a gematria value of 661.
661
Divisors: 2
1, 661
Sum: 662
Prev Star: 541
11th Star Number
Next Star: 793
Prev Prime: 659
121st Prime Number
Next Prime: 673
Mathematical Properties
Golden Numbern/a
Reduced Digit Sum4
Magic Constant144,402,721
Digital Root4
Octal433(1225)
Duodecimal937(471)
Hexadecimal1,633(295)
Binary1010010101
661st Values
Prime4,943
Triangular218,791
Square436,921
Star2,617,561
Pentagonal655,051
Cube288,804,781
Tetrahedral48,352,811
Square Pyramidal96,486,831
Fibonaccin/a
Harshad3,432
Happy Number4,527