668916369287 has 2 divisors, whose sum is σ = 668916369288. Its totient is φ = 668916369286.

The previous prime is 668916369283. The next prime is 668916369293. The reversal of 668916369287 is 782963619866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668916369287 - 2² = 668916369283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668916369287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668916369283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334458184643 + 334458184644.

It is an arithmetic number, because the mean of its divisors is an integer number (334458184644).

Almost surely, 2^668916369287 is an apocalyptic number.

668916369287 is a deficient number, since it is larger than the sum of its proper divisors (1).

668916369287 is an equidigital number, since it uses as much as digits as its factorization.

668916369287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282175488, while the sum is 71.

The spelling of 668916369287 in words is "six hundred sixty-eight billion, nine hundred sixteen million, three hundred sixty-nine thousand, two hundred eighty-seven".