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66666666667 is a prime number
BaseRepresentation
bin111110000101101001…
…001001101010101011
320101002010002120011111
4332011221021222223
52043013131313132
650343134011151
74550030213446
oct760551115253
9211063076144
1066666666667
1126300660437
1210b06646ab7
136395994073
14332604065d
151b02b76647
hexf85a49aab

66666666667 has 2 divisors, whose sum is σ = 66666666668. Its totient is φ = 66666666666.

The previous prime is 66666666643. The next prime is 66666666697. The reversal of 66666666667 is 76666666666.

Subtracting 66666666667 from its reverse (76666666666), we obtain a palindrome (9999999999).

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-66666666667 is a prime.

It is a super-4 number, since 4×666666666674 (a number of 44 digits) contains 4444 as substring.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (66666666697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333333333 + 33333333334.

It is an arithmetic number, because the mean of its divisors is an integer number (33333333334).

Almost surely, 266666666667 is an apocalyptic number.

66666666667 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666666667 is an equidigital number, since it uses as much as digits as its factorization.

66666666667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423263232, while the sum is 67.

The spelling of 66666666667 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-seven".