667178357317 has 2 divisors, whose sum is σ = 667178357318. Its totient is φ = 667178357316.

The previous prime is 667178357303. The next prime is 667178357371. The reversal of 667178357317 is 713753871766.

Together with next prime (667178357371) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616341185476 + 50837171841 = 785074^2 + 225471^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667178357317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667178351317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333589178658 + 333589178659.

It is an arithmetic number, because the mean of its divisors is an integer number (333589178659).

Almost surely, 2^667178357317 is an apocalyptic number.

It is an amenable number.

667178357317 is a deficient number, since it is larger than the sum of its proper divisors (1).

667178357317 is an equidigital number, since it uses as much as digits as its factorization.

667178357317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31116960, while the sum is 61.

The spelling of 667178357317 in words is "six hundred sixty-seven billion, one hundred seventy-eight million, three hundred fifty-seven thousand, three hundred seventeen".