268666813 has 2 divisors, whose sum is σ = 268666814. Its totient is φ = 268666812.

The previous prime is 268666799. The next prime is 268666829. The reversal of 268666813 is 318666862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151117849 + 117548964 = 12293^2 + 10842^2 .

It is a cyclic number.

It is not a de Polignac number, because 268666813 - 2⁵ = 268666781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268666313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134333406 + 134333407.

It is an arithmetic number, because the mean of its divisors is an integer number (134333407).

Almost surely, 2^268666813 is an apocalyptic number.

It is an amenable number.

268666813 is a deficient number, since it is larger than the sum of its proper divisors (1).

268666813 is an equidigital number, since it uses as much as digits as its factorization.

268666813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 46.

The square root of 268666813 is about 16391.0589346753. The cubic root of 268666813 is about 645.2648496686.

The spelling of 268666813 in words is "two hundred sixty-eight million, six hundred sixty-six thousand, eight hundred thirteen".