256631216311235 has 16 divisors (see below), whose sum is σ = 308196418014912. Its totient is φ = 205145718940800.

The previous prime is 256631216311207. The next prime is 256631216311241. The reversal of 256631216311235 is 532113612136652.

It is not a de Polignac number, because 256631216311235 - 2¹² = 256631216307139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256631216311235.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36671465 + ... + 43105205.

It is an arithmetic number, because the mean of its divisors is an integer number (19262276125932).

Almost surely, 2^{256631216311235} is an apocalyptic number.

256631216311235 is a deficient number, since it is larger than the sum of its proper divisors (51565201703677).

256631216311235 is a wasteful number, since it uses less digits than its factorization.

256631216311235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6439934.

The product of its digits is 1166400, while the sum is 47.

Adding to 256631216311235 its reverse (532113612136652), we get a palindrome (788744828447887).

The spelling of 256631216311235 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, two hundred sixteen million, three hundred eleven thousand, two hundred thirty-five".