666666666671 has 2 divisors, whose sum is σ = 666666666672. Its totient is φ = 666666666670.

The previous prime is 666666666619. The next prime is 666666666733. The reversal of 666666666671 is 176666666666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666666666671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666666662671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333333333335 + 333333333336.

It is an arithmetic number, because the mean of its divisors is an integer number (333333333336).

Almost surely, 2^666666666671 is an apocalyptic number.

666666666671 is a deficient number, since it is larger than the sum of its proper divisors (1).

666666666671 is an equidigital number, since it uses as much as digits as its factorization.

666666666671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423263232, while the sum is 68.

The spelling of 666666666671 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy-one".