256621126075506 has 12 divisors (see below), whose sum is σ = 556012439830302. Its totient is φ = 85540375358496.

The previous prime is 256621126075481. The next prime is 256621126075583. The reversal of 256621126075506 is 605570621126652.

256621126075506 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 2 + 1 + 1 + 2 + 60 + 75 + 506 = 666.

It can be written as a sum of positive squares in only one way, i.e., 249414269051025 + 7206857024481 = 15792855^2 + 2684559^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7128364613191 + ... + 7128364613226.

Almost surely, 2^{256621126075506} is an apocalyptic number.

256621126075506 is an abundant number, since it is smaller than the sum of its proper divisors (299391313754796).

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

256621126075506 is a wasteful number, since it uses less digits than its factorization.

256621126075506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14256729226425 (or 14256729226422 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 54.

The spelling of 256621126075506 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, one hundred twenty-six million, seventy-five thousand, five hundred six".