256788775508 has 48 divisors (see below), whose sum is σ = 463507122960. Its totient is φ = 124423163904.

The previous prime is 256788775427. The next prime is 256788775519. The reversal of 256788775508 is 805577887652.

It can be written as a sum of positive squares in 8 ways, for example, as 1145280964 + 255643494544 = 33842^2 + 505612^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10454810 + ... + 10479342.

It is an arithmetic number, because the mean of its divisors is an integer number (9656398395).

Almost surely, 2^256788775508 is an apocalyptic number.

It is an amenable number.

256788775508 is a deficient number, since it is larger than the sum of its proper divisors (206718347452).

256788775508 is a wasteful number, since it uses less digits than its factorization.

256788775508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25196 (or 25194 counting only the distinct ones).

The product of its (nonzero) digits is 263424000, while the sum is 68.

The spelling of 256788775508 in words is "two hundred fifty-six billion, seven hundred eighty-eight million, seven hundred seventy-five thousand, five hundred eight".