666666727 has 2 divisors, whose sum is σ = 666666728. Its totient is φ = 666666726.

The previous prime is 666666719. The next prime is 666666757. The reversal of 666666727 is 727666666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666666727 - 2³ = 666666719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666666757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333333363 + 333333364.

It is an arithmetic number, because the mean of its divisors is an integer number (333333364).

Almost surely, 2^666666727 is an apocalyptic number.

666666727 is a deficient number, since it is larger than the sum of its proper divisors (1).

666666727 is an equidigital number, since it uses as much as digits as its factorization.

666666727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 52.

The square root of 666666727 is about 25819.8901430661. The cubic root of 666666727 is about 873.5804910893.

The spelling of 666666727 in words is "six hundred sixty-six million, six hundred sixty-six thousand, seven hundred twenty-seven".