666673413257 has 2 divisors, whose sum is σ = 666673413258. Its totient is φ = 666673413256.

The previous prime is 666673413187. The next prime is 666673413379. The reversal of 666673413257 is 752314376666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421069912201 + 245603501056 = 648899^2 + 495584^2 .

It is a cyclic number.

It is not a de Polignac number, because 666673413257 - 2⁸ = 666673413001 is a prime.

It is not a weakly prime, because it can be changed into another prime (666673413557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333336706628 + 333336706629.

It is an arithmetic number, because the mean of its divisors is an integer number (333336706629).

Almost surely, 2^666673413257 is an apocalyptic number.

It is an amenable number.

666673413257 is a deficient number, since it is larger than the sum of its proper divisors (1).

666673413257 is an equidigital number, since it uses as much as digits as its factorization.

666673413257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 56.

The spelling of 666673413257 in words is "six hundred sixty-six billion, six hundred seventy-three million, four hundred thirteen thousand, two hundred fifty-seven".