668236843 has 2 divisors, whose sum is σ = 668236844. Its totient is φ = 668236842.

The previous prime is 668236841. The next prime is 668236853. The reversal of 668236843 is 348632866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668236843 - 2¹ = 668236841 is a prime.

Together with 668236841, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 668236793 and 668236802.

It is not a weakly prime, because it can be changed into another prime (668236841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334118421 + 334118422.

It is an arithmetic number, because the mean of its divisors is an integer number (334118422).

Almost surely, 2^668236843 is an apocalyptic number.

668236843 is a deficient number, since it is larger than the sum of its proper divisors (1).

668236843 is an equidigital number, since it uses as much as digits as its factorization.

668236843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 46.

The square root of 668236843 is about 25850.2774259775. The cubic root of 668236843 is about 874.2657646822.

The spelling of 668236843 in words is "six hundred sixty-eight million, two hundred thirty-six thousand, eight hundred forty-three".