256424504663 has 4 divisors (see below), whose sum is σ = 256628179080. Its totient is φ = 256220830248.

The previous prime is 256424504617. The next prime is 256424504669. The reversal of 256424504663 is 366405424652.

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 256424504663 - 2⁶ = 256424504599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256424504669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101835320 + ... + 101837837.

It is an arithmetic number, because the mean of its divisors is an integer number (64157044770).

Almost surely, 2^256424504663 is an apocalyptic number.

256424504663 is a deficient number, since it is larger than the sum of its proper divisors (203674417).

256424504663 is a wasteful number, since it uses less digits than its factorization.

256424504663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203674416.

The product of its (nonzero) digits is 4147200, while the sum is 47.

The spelling of 256424504663 in words is "two hundred fifty-six billion, four hundred twenty-four million, five hundred four thousand, six hundred sixty-three".