256536663256 has 32 divisors (see below), whose sum is σ = 481891250880. Its totient is φ = 128032480800.

The previous prime is 256536663203. The next prime is 256536663277. The reversal of 256536663256 is 652366635652.

It is a super-2 number, since 2×256536663256² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256536663197 and 256536663206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16946811 + ... + 16961941.

It is an arithmetic number, because the mean of its divisors is an integer number (15059101590).

Almost surely, 2^256536663256 is an apocalyptic number.

It is an amenable number.

256536663256 is a deficient number, since it is larger than the sum of its proper divisors (225354587624).

256536663256 is a wasteful number, since it uses less digits than its factorization.

256536663256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18895 (or 18891 counting only the distinct ones).

The product of its digits is 34992000, while the sum is 55.

The spelling of 256536663256 in words is "two hundred fifty-six billion, five hundred thirty-six million, six hundred sixty-three thousand, two hundred fifty-six".