256442156536 has 32 divisors (see below), whose sum is σ = 497464254000. Its totient is φ = 123785998336.

The previous prime is 256442156447. The next prime is 256442156543. The reversal of 256442156536 is 635651244652.

It is a self number, because there is not a number n which added to its sum of digits gives 256442156536.

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, 2230755 + ... + 2342893.

Almost surely, 2^256442156536 is an apocalyptic number.

It is an amenable number.

256442156536 is a deficient number, since it is larger than the sum of its proper divisors (241022097464).

256442156536 is a wasteful number, since it uses less digits than its factorization.

256442156536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122031 (or 122027 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 49.

The spelling of 256442156536 in words is "two hundred fifty-six billion, four hundred forty-two million, one hundred fifty-six thousand, five hundred thirty-six".