256589510442 has 128 divisors (see below), whose sum is σ = 548111646720. Its totient is φ = 79952806080.

The previous prime is 256589510417. The next prime is 256589510459. The reversal of 256589510442 is 244015985652.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 265345443 + ... + 265346409.

It is an arithmetic number, because the mean of its divisors is an integer number (4282122240).

Almost surely, 2^256589510442 is an apocalyptic number.

256589510442 is an abundant number, since it is smaller than the sum of its proper divisors (291522136278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256589510442 is a wasteful number, since it uses less digits than its factorization.

256589510442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416.

The product of its (nonzero) digits is 3456000, while the sum is 51.

The spelling of 256589510442 in words is "two hundred fifty-six billion, five hundred eighty-nine million, five hundred ten thousand, four hundred forty-two".