256477561243326 has 64 divisors (see below), whose sum is σ = 583196205234240. Its totient is φ = 83519456117760.

The previous prime is 256477561243129. The next prime is 256477561243433. The reversal of 256477561243326 is 623342165774652.

It is a happy number.

256477561243326 is a `hidden beast` number, since 2 + 5 + 6 + 4 + 7 + 7 + 5 + 61 + 243 + 326 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191639595 + ... + 192973286.

It is an arithmetic number, because the mean of its divisors is an integer number (9112440706785).

Almost surely, 2^{256477561243326} is an apocalyptic number.

256477561243326 is an abundant number, since it is smaller than the sum of its proper divisors (326718643990914).

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

256477561243326 is a wasteful number, since it uses less digits than its factorization.

256477561243326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384613178 (or 384613172 counting only the distinct ones).

The product of its digits is 304819200, while the sum is 63.

The spelling of 256477561243326 in words is "two hundred fifty-six trillion, four hundred seventy-seven billion, five hundred sixty-one million, two hundred forty-three thousand, three hundred twenty-six".