Number 66
The number 66 is the 11th triangular number, a palindrome. It has 8 divisors and a digital root of 3. Explore its full properties below, or find words and phrases with a gematria value of 66.
66
Divisors: 8
1, 2, 3, 6, 11, 22, 33, 66
Sum: 144
Prev Triangular: 55
11th Triangular Number
Next Triangular: 78
Prev Palindromic: 55
16th Palindromic Number
Next Palindromic: 77
Mathematical Properties
Golden Number44,945,570,212,853
Reduced Digit Sum3
Magic Constant143,781
Digital Root3
Octal54(102)
Duodecimal78(56)
Hexadecimal102(42)
Binary1000010
66th Values
Prime317
Triangular2,211
Square4,356
Star25,741
Pentagonal6,501
Cube287,496
Tetrahedral50,116
Square Pyramidal98,021
Fibonacci27,777,890,035,288
Harshad220
Happy Number478