256480896173 has 2 divisors, whose sum is σ = 256480896174. Its totient is φ = 256480896172.

The previous prime is 256480896143. The next prime is 256480896187. The reversal of 256480896173 is 371698084652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254841213124 + 1639683049 = 504818^2 + 40493^2 .

It is a cyclic number.

It is not a de Polignac number, because 256480896173 - 2³⁶ = 187761419437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256480896143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128240448086 + 128240448087.

It is an arithmetic number, because the mean of its divisors is an integer number (128240448087).

It is a 1-persistent number, because it is pandigital, but 2⋅256480896173 = 512961792346 is not.

Almost surely, 2^256480896173 is an apocalyptic number.

It is an amenable number.

256480896173 is a deficient number, since it is larger than the sum of its proper divisors (1).

256480896173 is an equidigital number, since it uses as much as digits as its factorization.

256480896173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 256480896173 in words is "two hundred fifty-six billion, four hundred eighty million, eight hundred ninety-six thousand, one hundred seventy-three".