256473067433185 has 4 divisors (see below), whose sum is σ = 307767680919828. Its totient is φ = 205178453946544.

The previous prime is 256473067433153. The next prime is 256473067433197. The reversal of 256473067433185 is 581334760374652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101687519864529 + 154785547568656 = 10084023^2 + 12441284^2 .

It is a cyclic number.

It is not a de Polignac number, because 256473067433185 - 2⁵ = 256473067433153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25647306743314 + ... + 25647306743323.

It is an arithmetic number, because the mean of its divisors is an integer number (76941920229957).

Almost surely, 2^{256473067433185} is an apocalyptic number.

It is an amenable number.

256473067433185 is a deficient number, since it is larger than the sum of its proper divisors (51294613486643).

256473067433185 is an equidigital number, since it uses as much as digits as its factorization.

256473067433185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51294613486642.

The product of its (nonzero) digits is 304819200, while the sum is 64.

The spelling of 256473067433185 in words is "two hundred fifty-six trillion, four hundred seventy-three billion, sixty-seven million, four hundred thirty-three thousand, one hundred eighty-five".