667687949786743 has 2 divisors, whose sum is σ = 667687949786744. Its totient is φ = 667687949786742.

The previous prime is 667687949786713. The next prime is 667687949786791. The reversal of 667687949786743 is 347687949786766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667687949786743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667687949786713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333843974893371 + 333843974893372.

It is an arithmetic number, because the mean of its divisors is an integer number (333843974893372).

Almost surely, 2^{667687949786743} is an apocalyptic number.

667687949786743 is a deficient number, since it is larger than the sum of its proper divisors (1).

667687949786743 is an equidigital number, since it uses as much as digits as its factorization.

667687949786743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774289539072, while the sum is 97.

The spelling of 667687949786743 in words is "six hundred sixty-seven trillion, six hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-six thousand, seven hundred forty-three".