667646688193 has 2 divisors, whose sum is σ = 667646688194. Its totient is φ = 667646688192.

The previous prime is 667646688169. The next prime is 667646688221. The reversal of 667646688193 is 391886646766.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609550263169 + 58096425024 = 780737^2 + 241032^2 .

It is a cyclic number.

It is not a de Polignac number, because 667646688193 - 2⁵ = 667646688161 is a prime.

It is not a weakly prime, because it can be changed into another prime (667646688113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333823344096 + 333823344097.

It is an arithmetic number, because the mean of its divisors is an integer number (333823344097).

Almost surely, 2^667646688193 is an apocalyptic number.

It is an amenable number.

667646688193 is a deficient number, since it is larger than the sum of its proper divisors (1).

667646688193 is an equidigital number, since it uses as much as digits as its factorization.

667646688193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376233984, while the sum is 70.

The spelling of 667646688193 in words is "six hundred sixty-seven billion, six hundred forty-six million, six hundred eighty-eight thousand, one hundred ninety-three".