256005511521008 has 10 divisors (see below), whose sum is σ = 496010678571984. Its totient is φ = 128002755760496.

The previous prime is 256005511520989. The next prime is 256005511521013. The reversal of 256005511521008 is 800125115500652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8000172235016 + ... + 8000172235047.

Almost surely, 2^{256005511521008} is an apocalyptic number.

It is an amenable number.

256005511521008 is a deficient number, since it is larger than the sum of its proper divisors (240005167050976).

256005511521008 is a wasteful number, since it uses less digits than its factorization.

256005511521008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16000344470071 (or 16000344470065 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 41.

The spelling of 256005511521008 in words is "two hundred fifty-six trillion, five billion, five hundred eleven million, five hundred twenty-one thousand, eight".