256875635249 has 2 divisors, whose sum is σ = 256875635250. Its totient is φ = 256875635248.

The previous prime is 256875635227. The next prime is 256875635299. The reversal of 256875635249 is 942536578652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174272851600 + 82602783649 = 417460^2 + 287407^2 .

It is a cyclic number.

It is not a de Polignac number, because 256875635249 - 2²⁰ = 256874586673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256875635191 and 256875635200.

It is not a weakly prime, because it can be changed into another prime (256875635299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128437817624 + 128437817625.

It is an arithmetic number, because the mean of its divisors is an integer number (128437817625).

Almost surely, 2^256875635249 is an apocalyptic number.

It is an amenable number.

256875635249 is a deficient number, since it is larger than the sum of its proper divisors (1).

256875635249 is an equidigital number, since it uses as much as digits as its factorization.

256875635249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864000, while the sum is 62.

The spelling of 256875635249 in words is "two hundred fifty-six billion, eight hundred seventy-five million, six hundred thirty-five thousand, two hundred forty-nine".