256743503713771 has 2 divisors, whose sum is σ = 256743503713772. Its totient is φ = 256743503713770.

The previous prime is 256743503713747. The next prime is 256743503713787. The reversal of 256743503713771 is 177317305347652.

It is a happy number.

256743503713771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256743503713771 is a prime.

It is not a weakly prime, because it can be changed into another prime (256743563713771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128371751856885 + 128371751856886.

It is an arithmetic number, because the mean of its divisors is an integer number (128371751856886).

Almost surely, 2^{256743503713771} is an apocalyptic number.

256743503713771 is a deficient number, since it is larger than the sum of its proper divisors (1).

256743503713771 is an equidigital number, since it uses as much as digits as its factorization.

256743503713771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77792400, while the sum is 61.

The spelling of 256743503713771 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, five hundred three million, seven hundred thirteen thousand, seven hundred seventy-one".