Representation numerals

ξϛʹ

٦٦

LXVI

●●●

●

▃▃▃▃▃

▃▃▃▃▃

六十六

סו

Numeral systems

Binary: 1000010

Septimal (base 7): 123

Octal: 102

Hexadecimal: 42

Base 24: 2I

Factorization

66 = 2 × 3 × 11

66 has 8 divisors: 1, 2, 3, 6, 11, 22, 33, 66

Sum of all divisors other than 66: 78

Sums & differences

Goldbach conjecture: 66 = 61 + 5 = 59 + 7 = 53 + 13 = 47 + 19 = 43 + 23 = 37 + 29

Characteristics

66 is a triangular number

●

● ●

● ● ●

● ● ● ●

● ● ● ● ●

● ● ● ● ● ●

● ● ● ● ● ● ●

● ● ● ● ● ● ● ●

● ● ● ● ● ● ● ● ●

● ● ● ● ● ● ● ● ● ●

● ● ● ● ● ● ● ● ● ● ●

The next triangular is: 78

●

● ●

● ● ●

● ● ● ●

● ● ● ● ●

● ● ● ● ● ●

● ● ● ● ● ● ●

● ● ● ● ● ● ● ●

● ● ● ● ● ● ● ● ●

● ● ● ● ● ● ● ● ● ●

● ● ● ● ● ● ● ● ● ● ●

The next triangular is: 78

66 is a hexagonal number

66 is a palindromic number in decimal system