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Six is the second smallest composite number, its proper divisors being 1, 2 and 3.
Six is also a unitary perfect number, a harmonic divisor number and a highly composite number.
In binary code, six is 110; in ternary code six is 20; in quaternary numeral system code six is 12; in quinary six is 11; in senary six is 10; in septenary code and all codes above (such as octal, decimal and hexadecimal) six is 6.