256207266128 has 40 divisors (see below), whose sum is σ = 542197026336. Its totient is φ = 116314185600.

The previous prime is 256207266041. The next prime is 256207266143. The reversal of 256207266128 is 821662702652.

It is a happy number.

It is a super-2 number, since 2×256207266128² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754751 + ... + 1040222.

Almost surely, 2^256207266128 is an apocalyptic number.

It is an amenable number.

256207266128 is an abundant number, since it is smaller than the sum of its proper divisors (285989760208).

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

256207266128 is a wasteful number, since it uses less digits than its factorization.

256207266128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795803 (or 1795797 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 256207266128 in words is "two hundred fifty-six billion, two hundred seven million, two hundred sixty-six thousand, one hundred twenty-eight".