668241257843 has 2 divisors, whose sum is σ = 668241257844. Its totient is φ = 668241257842.

The previous prime is 668241257833. The next prime is 668241257903. The reversal of 668241257843 is 348752142866.

668241257843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668241257843 - 2²⁰ = 668240209267 is a prime.

It is not a weakly prime, because it can be changed into another prime (668241257833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334120628921 + 334120628922.

It is an arithmetic number, because the mean of its divisors is an integer number (334120628922).

Almost surely, 2^668241257843 is an apocalyptic number.

668241257843 is a deficient number, since it is larger than the sum of its proper divisors (1).

668241257843 is an equidigital number, since it uses as much as digits as its factorization.

668241257843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15482880, while the sum is 56.

The spelling of 668241257843 in words is "six hundred sixty-eight billion, two hundred forty-one million, two hundred fifty-seven thousand, eight hundred forty-three".