256402332047 has 2 divisors, whose sum is σ = 256402332048. Its totient is φ = 256402332046.

The previous prime is 256402332013. The next prime is 256402332071. The reversal of 256402332047 is 740233204652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256402332047 - 2¹⁰ = 256402331023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256402332047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256402332007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128201166023 + 128201166024.

It is an arithmetic number, because the mean of its divisors is an integer number (128201166024).

Almost surely, 2^256402332047 is an apocalyptic number.

256402332047 is a deficient number, since it is larger than the sum of its proper divisors (1).

256402332047 is an equidigital number, since it uses as much as digits as its factorization.

256402332047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 38.

Adding to 256402332047 its reverse (740233204652), we get a palindrome (996635536699).

The spelling of 256402332047 in words is "two hundred fifty-six billion, four hundred two million, three hundred thirty-two thousand, forty-seven".