668248843 has 2 divisors, whose sum is σ = 668248844. Its totient is φ = 668248842.

The previous prime is 668248817. The next prime is 668248871. The reversal of 668248843 is 348842866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668248843 is a prime.

It is not a weakly prime, because it can be changed into another prime (668248813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334124421 + 334124422.

It is an arithmetic number, because the mean of its divisors is an integer number (334124422).

Almost surely, 2^668248843 is an apocalyptic number.

668248843 is a deficient number, since it is larger than the sum of its proper divisors (1).

668248843 is an equidigital number, since it uses as much as digits as its factorization.

668248843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1769472, while the sum is 49.

The square root of 668248843 is about 25850.5095307617. The cubic root of 668248843 is about 874.2709979197.

The spelling of 668248843 in words is "six hundred sixty-eight million, two hundred forty-eight thousand, eight hundred forty-three".