256605535544 has 16 divisors (see below), whose sum is σ = 487225701600. Its totient is φ = 126678681792.

The previous prime is 256605535513. The next prime is 256605535577. The reversal of 256605535544 is 445535506652.

It is a junction number, because it is equal to n+sod(n) for n = 256605535492 and 256605535501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203010077 + ... + 203011340.

It is an arithmetic number, because the mean of its divisors is an integer number (30451606350).

Almost surely, 2^256605535544 is an apocalyptic number.

It is an amenable number.

256605535544 is a deficient number, since it is larger than the sum of its proper divisors (230620166056).

256605535544 is a wasteful number, since it uses less digits than its factorization.

256605535544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406021502 (or 406021498 counting only the distinct ones).

The product of its (nonzero) digits is 10800000, while the sum is 50.

The spelling of 256605535544 in words is "two hundred fifty-six billion, six hundred five million, five hundred thirty-five thousand, five hundred forty-four".