256471287073 has 2 divisors, whose sum is σ = 256471287074. Its totient is φ = 256471287072.

The previous prime is 256471287043. The next prime is 256471287103. The reversal of 256471287073 is 370782174652.

256471287073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (256471287043) and next prime (256471287103).

It can be written as a sum of positive squares in only one way, i.e., 177053283729 + 79418003344 = 420777^2 + 281812^2 .

It is a cyclic number.

It is not a de Polignac number, because 256471287073 - 2⁵ = 256471287041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256471287073.

It is not a weakly prime, because it can be changed into another prime (256471287043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128235643536 + 128235643537.

It is an arithmetic number, because the mean of its divisors is an integer number (128235643537).

Almost surely, 2^256471287073 is an apocalyptic number.

It is an amenable number.

256471287073 is a deficient number, since it is larger than the sum of its proper divisors (1).

256471287073 is an equidigital number, since it uses as much as digits as its factorization.

256471287073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3951360, while the sum is 52.

The spelling of 256471287073 in words is "two hundred fifty-six billion, four hundred seventy-one million, two hundred eighty-seven thousand, seventy-three".