255121706256 has 40 divisors (see below), whose sum is σ = 693752010720. Its totient is φ = 80564749056.

The previous prime is 255121706249. The next prime is 255121706261. The reversal of 255121706256 is 652607121552.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139868445 + ... + 139870268.

It is an arithmetic number, because the mean of its divisors is an integer number (17343800268).

Almost surely, 2^255121706256 is an apocalyptic number.

It is an amenable number.

255121706256 is an abundant number, since it is smaller than the sum of its proper divisors (438630304464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255121706256 is a wasteful number, since it uses less digits than its factorization.

255121706256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279738743 (or 279738737 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 255121706256 in words is "two hundred fifty-five billion, one hundred twenty-one million, seven hundred six thousand, two hundred fifty-six".