256380278956 has 12 divisors (see below), whose sum is σ = 448696722600. Its totient is φ = 128181215360.

The previous prime is 256380278953. The next prime is 256380278971. The reversal of 256380278956 is 659872083652.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 256380278894 and 256380278903.

It is not an unprimeable number, because it can be changed into a prime (256380278951) 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, 2166181 + ... + 2281468.

It is an arithmetic number, because the mean of its divisors is an integer number (37391393550).

Almost surely, 2^256380278956 is an apocalyptic number.

It is an amenable number.

256380278956 is a deficient number, since it is larger than the sum of its proper divisors (192316443644).

256380278956 is a wasteful number, since it uses less digits than its factorization.

256380278956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4462064 (or 4462062 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 61.

The spelling of 256380278956 in words is "two hundred fifty-six billion, three hundred eighty million, two hundred seventy-eight thousand, nine hundred fifty-six".