256993803 has 20 divisors (see below), whose sum is σ = 418806168. Its totient is φ = 155753280.

The previous prime is 256993783. The next prime is 256993817. The reversal of 256993803 is 308399652.

256993803 is a `hidden beast` number, since 2 + 569 + 9 + 3 + 80 + 3 = 666.

256993803 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256993803 - 2⁹ = 256993291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256993003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 143326 + ... + 145107.

Almost surely, 2^256993803 is an apocalyptic number.

256993803 is a deficient number, since it is larger than the sum of its proper divisors (161812365).

256993803 is a wasteful number, since it uses less digits than its factorization.

256993803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288456 (or 288447 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 256993803 is about 16031.0262615966. The cubic root of 256993803 is about 635.7810077293.

The spelling of 256993803 in words is "two hundred fifty-six million, nine hundred ninety-three thousand, eight hundred three".