2556913769 has 2 divisors, whose sum is σ = 2556913770. Its totient is φ = 2556913768.

The previous prime is 2556913741. The next prime is 2556913813. The reversal of 2556913769 is 9673196552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2444808025 + 112105744 = 49445^2 + 10588^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556913769 - 2¹² = 2556909673 is a prime.

It is a super-2 number, since 2×2556913769² = 13075616044203570722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2556913769.

It is not a weakly prime, because it can be changed into another prime (2556913969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278456884 + 1278456885.

It is an arithmetic number, because the mean of its divisors is an integer number (1278456885).

Almost surely, 2^2556913769 is an apocalyptic number.

It is an amenable number.

2556913769 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556913769 is an equidigital number, since it uses as much as digits as its factorization.

2556913769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 53.

The square root of 2556913769 is about 50565.9348672602. The cubic root of 2556913769 is about 1367.4308091196.

The spelling of 2556913769 in words is "two billion, five hundred fifty-six million, nine hundred thirteen thousand, seven hundred sixty-nine".