256865498259 has 4 divisors (see below), whose sum is σ = 342487331016. Its totient is φ = 171243665504.

The previous prime is 256865498209. The next prime is 256865498287. The reversal of 256865498259 is 952894568652.

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

It is a cyclic number.

It is not a de Polignac number, because 256865498259 - 2⁹ = 256865497747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256865498193 and 256865498202.

It is not an unprimeable number, because it can be changed into a prime (256865498209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42810916374 + ... + 42810916379.

It is an arithmetic number, because the mean of its divisors is an integer number (85621832754).

Almost surely, 2^256865498259 is an apocalyptic number.

256865498259 is a deficient number, since it is larger than the sum of its proper divisors (85621832757).

256865498259 is an equidigital number, since it uses as much as digits as its factorization.

256865498259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85621832756.

The product of its digits is 373248000, while the sum is 69.

The spelling of 256865498259 in words is "two hundred fifty-six billion, eight hundred sixty-five million, four hundred ninety-eight thousand, two hundred fifty-nine".