256603400603 has 32 divisors (see below), whose sum is σ = 296690688000. Its totient is φ = 219480671520.

The previous prime is 256603400531. The next prime is 256603400609. The reversal of 256603400603 is 306004306652.

It is not a de Polignac number, because 256603400603 - 2¹⁰ = 256603399579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256603400609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50920958 + ... + 50925996.

It is an arithmetic number, because the mean of its divisors is an integer number (9271584000).

Almost surely, 2^256603400603 is an apocalyptic number.

256603400603 is a deficient number, since it is larger than the sum of its proper divisors (40087287397).

256603400603 is a wasteful number, since it uses less digits than its factorization.

256603400603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6695.

The product of its (nonzero) digits is 77760, while the sum is 35.

The spelling of 256603400603 in words is "two hundred fifty-six billion, six hundred three million, four hundred thousand, six hundred three".