256819775456 has 48 divisors (see below), whose sum is σ = 513635810688. Its totient is φ = 126378940800.

The previous prime is 256819775441. The next prime is 256819775467. The reversal of 256819775456 is 654577918652.

It is a junction number, because it is equal to n+sod(n) for n = 256819775392 and 256819775401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1198331 + ... + 1396293.

It is an arithmetic number, because the mean of its divisors is an integer number (10700746056).

Almost surely, 2^256819775456 is an apocalyptic number.

It is an amenable number.

256819775456 is a deficient number, since it is larger than the sum of its proper divisors (256816035232).

256819775456 is a wasteful number, since it uses less digits than its factorization.

256819775456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198615 (or 198607 counting only the distinct ones).

The product of its digits is 127008000, while the sum is 65.

The spelling of 256819775456 in words is "two hundred fifty-six billion, eight hundred nineteen million, seven hundred seventy-five thousand, four hundred fifty-six".