666814727 has 2 divisors, whose sum is σ = 666814728. Its totient is φ = 666814726.

The previous prime is 666814699. The next prime is 666814751. The reversal of 666814727 is 727418666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666814727 - 2⁶ = 666814663 is a prime.

It is a super-3 number, since 3×666814727³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666814327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333407363 + 333407364.

It is an arithmetic number, because the mean of its divisors is an integer number (333407364).

Almost surely, 2^666814727 is an apocalyptic number.

666814727 is a deficient number, since it is larger than the sum of its proper divisors (1).

666814727 is an equidigital number, since it uses as much as digits as its factorization.

666814727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 666814727 is about 25822.7559915668. The cubic root of 666814727 is about 873.6451312567.

The spelling of 666814727 in words is "six hundred sixty-six million, eight hundred fourteen thousand, seven hundred twenty-seven".