256165220272 has 40 divisors (see below), whose sum is σ = 546928803344. Its totient is φ = 115480560384.

The previous prime is 256165220251. The next prime is 256165220291. The reversal of 256165220272 is 272022561652.

It is a happy number.

256165220272 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14311563 + ... + 14329450.

Almost surely, 2^256165220272 is an apocalyptic number.

It is an amenable number.

256165220272 is an abundant number, since it is smaller than the sum of its proper divisors (290763583072).

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

256165220272 is a wasteful number, since it uses less digits than its factorization.

256165220272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28641077 (or 28641071 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 256165220272 in words is "two hundred fifty-six billion, one hundred sixty-five million, two hundred twenty thousand, two hundred seventy-two".