256631211617274 has 48 divisors (see below), whose sum is σ = 598863189901704. Its totient is φ = 78955929360000.

The previous prime is 256631211617273. The next prime is 256631211617311. The reversal of 256631211617274 is 472716112136652.

256631211617274 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 3 + 1 + 2 + 11 + 617 + 2 + 7 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 209762879475249 + 46868332142025 = 14483193^2 + 6846045^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256631211617274.

It is not an unprimeable number, because it can be changed into a prime (256631211617273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49762297 + ... + 54676764.

Almost surely, 2^{256631211617274} is an apocalyptic number.

256631211617274 is an abundant number, since it is smaller than the sum of its proper divisors (342231978284430).

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

256631211617274 is a wasteful number, since it uses less digits than its factorization.

256631211617274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104449583 (or 104449580 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 256631211617274 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, two hundred eleven million, six hundred seventeen thousand, two hundred seventy-four".