666057677 has 2 divisors, whose sum is σ = 666057678. Its totient is φ = 666057676.

The previous prime is 666057629. The next prime is 666057709. The reversal of 666057677 is 776750666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629708836 + 36348841 = 25094^2 + 6029^2 .

It is a cyclic number.

It is not a de Polignac number, because 666057677 - 2²⁸ = 397622221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666057607) 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, 333028838 + 333028839.

It is an arithmetic number, because the mean of its divisors is an integer number (333028839).

Almost surely, 2^666057677 is an apocalyptic number.

It is an amenable number.

666057677 is a deficient number, since it is larger than the sum of its proper divisors (1).

666057677 is an equidigital number, since it uses as much as digits as its factorization.

666057677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2222640, while the sum is 50.

The square root of 666057677 is about 25808.0932461118. The cubic root of 666057677 is about 873.3143829613.

The spelling of 666057677 in words is "six hundred sixty-six million, fifty-seven thousand, six hundred seventy-seven".