268402657 has 2 divisors, whose sum is σ = 268402658. Its totient is φ = 268402656.

The previous prime is 268402633. The next prime is 268402669. The reversal of 268402657 is 756204862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248251536 + 20151121 = 15756^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 268402657 - 2²³ = 260014049 is a prime.

It is not a weakly prime, because it can be changed into another prime (268402697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134201328 + 134201329.

It is an arithmetic number, because the mean of its divisors is an integer number (134201329).

Almost surely, 2^268402657 is an apocalyptic number.

It is an amenable number.

268402657 is a deficient number, since it is larger than the sum of its proper divisors (1).

268402657 is an equidigital number, since it uses as much as digits as its factorization.

268402657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 268402657 is about 16382.9990233779. Note that the first 3 decimals coincide. The cubic root of 268402657 is about 645.0533032887.

The spelling of 268402657 in words is "two hundred sixty-eight million, four hundred two thousand, six hundred fifty-seven".