268306388281 has 2 divisors, whose sum is σ = 268306388282. Its totient is φ = 268306388280.

The previous prime is 268306388261. The next prime is 268306388327. The reversal of 268306388281 is 182883603862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264093210000 + 4213178281 = 513900^2 + 64909^2 .

It is a cyclic number.

It is not a de Polignac number, because 268306388281 - 2⁵ = 268306388249 is a prime.

It is a super-2 number, since 2×268306388281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (268306388261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134153194140 + 134153194141.

It is an arithmetic number, because the mean of its divisors is an integer number (134153194141).

Almost surely, 2^268306388281 is an apocalyptic number.

It is an amenable number.

268306388281 is a deficient number, since it is larger than the sum of its proper divisors (1).

268306388281 is an equidigital number, since it uses as much as digits as its factorization.

268306388281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5308416, while the sum is 55.

The spelling of 268306388281 in words is "two hundred sixty-eight billion, three hundred six million, three hundred eighty-eight thousand, two hundred eighty-one".