256428056803 has 4 divisors (see below), whose sum is σ = 256638763080. Its totient is φ = 256217350528.

The previous prime is 256428056791. The next prime is 256428056921. The reversal of 256428056803 is 308650824652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256428056803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256428057803) 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, 105351313 + ... + 105353746.

It is an arithmetic number, because the mean of its divisors is an integer number (64159690770).

Almost surely, 2^256428056803 is an apocalyptic number.

256428056803 is a deficient number, since it is larger than the sum of its proper divisors (210706277).

256428056803 is a wasteful number, since it uses less digits than its factorization.

256428056803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210706276.

The product of its (nonzero) digits is 2764800, while the sum is 49.

The spelling of 256428056803 in words is "two hundred fifty-six billion, four hundred twenty-eight million, fifty-six thousand, eight hundred three".