256606503603 has 4 divisors (see below), whose sum is σ = 342142004808. Its totient is φ = 171071002400.

The previous prime is 256606503583. The next prime is 256606503611. The reversal of 256606503603 is 306305606652.

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

It is a cyclic number.

It is not a de Polignac number, because 256606503603 - 2⁶ = 256606503539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256606503623) 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, 42767750598 + ... + 42767750603.

It is an arithmetic number, because the mean of its divisors is an integer number (85535501202).

Almost surely, 2^256606503603 is an apocalyptic number.

256606503603 is a deficient number, since it is larger than the sum of its proper divisors (85535501205).

256606503603 is an equidigital number, since it uses as much as digits as its factorization.

256606503603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85535501204.

The product of its (nonzero) digits is 583200, while the sum is 42.

The spelling of 256606503603 in words is "two hundred fifty-six billion, six hundred six million, five hundred three thousand, six hundred three".