256878676225 has 12 divisors (see below), whose sum is σ = 327138466684. Its totient is φ = 199948806720.

The previous prime is 256878676217. The next prime is 256878676267. The reversal of 256878676225 is 522676878652.

It is a Cunningham number, because it is equal to 506832²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1 + 256878676224 = 1^2 + 506832^2 .

It is not a de Polignac number, because 256878676225 - 2³ = 256878676217 is a prime.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138852414 + ... + 138854263.

Almost surely, 2^256878676225 is an apocalyptic number.

256878676225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256878676225 is a deficient number, since it is larger than the sum of its proper divisors (70259790459).

256878676225 is a wasteful number, since it uses less digits than its factorization.

256878676225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277706724 (or 277706719 counting only the distinct ones).

The product of its digits is 135475200, while the sum is 64.

The spelling of 256878676225 in words is "two hundred fifty-six billion, eight hundred seventy-eight million, six hundred seventy-six thousand, two hundred twenty-five".