1268925578281 has 2 divisors, whose sum is σ = 1268925578282. Its totient is φ = 1268925578280.

The previous prime is 1268925578237. The next prime is 1268925578293. The reversal of 1268925578281 is 1828755298621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687838009600 + 581087568681 = 829360^2 + 762291^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268925578281 - 2²⁵ = 1268892023849 is a prime.

It is a super-2 number, since 2×1268925578281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1268925578201) 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, 634462789140 + 634462789141.

It is an arithmetic number, because the mean of its divisors is an integer number (634462789141).

Almost surely, 2^{1268925578281} is an apocalyptic number.

It is an amenable number.

1268925578281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268925578281 is an equidigital number, since it uses as much as digits as its factorization.

1268925578281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38707200, while the sum is 64.

The spelling of 1268925578281 in words is "one trillion, two hundred sixty-eight billion, nine hundred twenty-five million, five hundred seventy-eight thousand, two hundred eighty-one".