1268645857 has 2 divisors, whose sum is σ = 1268645858. Its totient is φ = 1268645856.

The previous prime is 1268645843. The next prime is 1268645867. The reversal of 1268645857 is 7585468621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931409361 + 337236496 = 30519^2 + 18364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268645857 - 2²⁷ = 1134428129 is a prime.

It is a super-3 number, since 3×1268645857³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1268645867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634322928 + 634322929.

It is an arithmetic number, because the mean of its divisors is an integer number (634322929).

Almost surely, 2^1268645857 is an apocalyptic number.

It is an amenable number.

1268645857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268645857 is an equidigital number, since it uses as much as digits as its factorization.

1268645857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3225600, while the sum is 52.

The square root of 1268645857 is about 35618.0552108057. The cubic root of 1268645857 is about 1082.5471022606.

The spelling of 1268645857 in words is "one billion, two hundred sixty-eight million, six hundred forty-five thousand, eight hundred fifty-seven".