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66666667 is a prime number
BaseRepresentation
bin1111111001010…
…0000010101011
311122110000110211
43332110002223
5114031313132
610340521551
71436441314
oct376240253
9148400424
1066666667
11346a4721
121a3b02b7
1310a72542
148bd560b
155cbd147
hex3f940ab

66666667 has 2 divisors, whose sum is σ = 66666668. Its totient is φ = 66666666.

The previous prime is 66666653. The next prime is 66666683. The reversal of 66666667 is 76666666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-66666667 is a prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66666667.

It is not a weakly prime, because it can be changed into another prime (66661667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333333 + 33333334.

It is an arithmetic number, because the mean of its divisors is an integer number (33333334).

Almost surely, 266666667 is an apocalyptic number.

66666667 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666667 is an equidigital number, since it uses as much as digits as its factorization.

66666667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 49.

The square root of 66666667 is about 8164.9658296897. The cubic root of 66666667 is about 405.4801337140.

Subtracting 66666667 from its reverse (76666666), we obtain a palindrome (9999999).

The spelling of 66666667 in words is "sixty-six million, six hundred sixty-six thousand, six hundred sixty-seven".