668245290887 has 2 divisors, whose sum is σ = 668245290888. Its totient is φ = 668245290886.

The previous prime is 668245290883. The next prime is 668245290899. The reversal of 668245290887 is 788092542866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668245290887 - 2² = 668245290883 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668245290883) 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, 334122645443 + 334122645444.

It is an arithmetic number, because the mean of its divisors is an integer number (334122645444).

Almost surely, 2^668245290887 is an apocalyptic number.

668245290887 is a deficient number, since it is larger than the sum of its proper divisors (1).

668245290887 is an equidigital number, since it uses as much as digits as its factorization.

668245290887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92897280, while the sum is 65.

The spelling of 668245290887 in words is "six hundred sixty-eight billion, two hundred forty-five million, two hundred ninety thousand, eight hundred eighty-seven".