256563605109 has 96 divisors (see below), whose sum is σ = 411881963520. Its totient is φ = 141585470208.

The previous prime is 256563605083. The next prime is 256563605131. The reversal of 256563605109 is 901506365652.

It is not a de Polignac number, because 256563605109 - 2¹¹ = 256563603061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256563605189) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 107662932 + ... + 107665314.

It is an arithmetic number, because the mean of its divisors is an integer number (4290437120).

Almost surely, 2^256563605109 is an apocalyptic number.

It is an amenable number.

256563605109 is a deficient number, since it is larger than the sum of its proper divisors (155318358411).

256563605109 is a wasteful number, since it uses less digits than its factorization.

256563605109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679 (or 2672 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 48.

The spelling of 256563605109 in words is "two hundred fifty-six billion, five hundred sixty-three million, six hundred five thousand, one hundred nine".