268626557 has 2 divisors, whose sum is σ = 268626558. Its totient is φ = 268626556.

The previous prime is 268626551. The next prime is 268626593. The reversal of 268626557 is 755626862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164198596 + 104427961 = 12814^2 + 10219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268626557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268626551) 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, 134313278 + 134313279.

It is an arithmetic number, because the mean of its divisors is an integer number (134313279).

Almost surely, 2^268626557 is an apocalyptic number.

It is an amenable number.

268626557 is a deficient number, since it is larger than the sum of its proper divisors (1).

268626557 is an equidigital number, since it uses as much as digits as its factorization.

268626557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 47.

The square root of 268626557 is about 16389.8309021173. The cubic root of 268626557 is about 645.2326200593.

The spelling of 268626557 in words is "two hundred sixty-eight million, six hundred twenty-six thousand, five hundred fifty-seven".