256304565406 has 4 divisors (see below), whose sum is σ = 384456848112. Its totient is φ = 128152282702.

The previous prime is 256304565389. The next prime is 256304565409. The reversal of 256304565406 is 604565403652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256304565409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64076141350 + ... + 64076141353.

It is an arithmetic number, because the mean of its divisors is an integer number (96114212028).

Almost surely, 2^256304565406 is an apocalyptic number.

256304565406 is a deficient number, since it is larger than the sum of its proper divisors (128152282706).

256304565406 is a wasteful number, since it uses less digits than its factorization.

256304565406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128152282705.

The product of its (nonzero) digits is 2592000, while the sum is 46.

The spelling of 256304565406 in words is "two hundred fifty-six billion, three hundred four million, five hundred sixty-five thousand, four hundred six".