66

Previous number

65

Next number

67

Sum of digits

12

Divisors of 66

Number of divisors

8

Sum of divisors

144

Factorization

66 = 2 × 3 × 11

Prime factors of 66

Factor Count
2 1
3 1
11 1

Square of 66

4356

Cube of 66

287496

Square root of 66

8.12403840463596083054653718136251...

Cube root of 66

4.04124002062219034314693999476731...

66th triangle number

2211

Reciprocal of 66

0.0151515151515152

Binary of 66

1000010

Number of digits of 66 in base 2

7

Octal of 66

102

Hexadecimal of 66

42

Prime number No
Hexagonal number Yes
Perfect number No
Deficient number No
Abundant number No
Mersenne number No
Harshad number No
Harmonic divisor number No

Quadratic residues of 66

QR66 (sequence)

66th composite number

91

Euler's totient function of 66

20

Carmichael function of 66

10

Möbius function of 66

-1

Properties of 66

Properties of the number 66: 66 has 8 divisors. The divisors of 66 are 1, 2, 3, 6, 11, 22, 33, 66 and the sum of them is 144. The factorization of 66 is 2 × 3 × 11. The square and cube of 66 are 4356 and 287496 respectively. The square root and cube root of 66 are 8.12403840463596083054653718136251... and 4.04124002062219034314693999476731.... The binary, octal, hexadecimal of 66 are 1000010, 102, 42. 66 is not a prime number, hexagonal number, not perfect number, not deficient number, not Mersenne number, not Mersenne number, not Harshad number, not harmonic divisor number.

sin 66

-0.02655115402396679424867897978402...

cos 66

-0.99964745596634996260831940162461...

tan 66

0.02656051777603939123562071245033...

sin 66°

0.91354545764260086659902526662336...

cos 66°

0.40673664307580020826904387831746...

tan 66°

2.24603677390421641035800348618068...

log 66

4.18965474202642518264383397763595...

log10 66

1.81954393554186877324241322639864...

log2 66

6.04439411935845338774697665940039...

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