Mathematically 67

                                                                        Sixty Seven (67)

1. It is the smallest number which is both palindromic in base 5 and 6.
(67)10 = (232)5 = (151)6

2. The sum of 5 consecutive prime numbers starting from 7 is 67.
7 + 11 + 13 + 17 + 19 = 67

3. The cousin prime of 67 is 71. Two primes that differ by 4 is called Cousin Primes.
(3, 7), (7, 11), (13, 17)... etc. are cousin primes

4. The atomic number of Homium is 67.

5. It is the maximal number of regions into which 11 lines divides a plane.

6. It is a centered 11- gonal and 22- gonal number.

7. A prime number with a 7 in it form an interesting pattern.
67 x 67 = 4489
667 x 667 = 444889
6667 x 6667 = 44448889

8. More interesting fact
67=(110)+(111)+(112)
      = 1 + 11 + 55

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DR RAJESH KUMAR THAKUR
rkthakur1974@gmail.com