12781806256 has 40 divisors (see below), whose sum is σ = 25213006800. Its totient is φ = 6275470080.

The previous prime is 12781806241. The next prime is 12781806263. The reversal of 12781806256 is 65260818721.

It is a super-3 number, since 3×12781806256³ (a number of 31 digits) contains 333 as substring.

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, 881110 + ... + 895498.

It is an arithmetic number, because the mean of its divisors is an integer number (630325170).

Almost surely, 2^12781806256 is an apocalyptic number.

12781806256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12781806256 is a deficient number, since it is larger than the sum of its proper divisors (12431200544).

12781806256 is a wasteful number, since it uses less digits than its factorization.

12781806256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15397 (or 15391 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 12781806256 in words is "twelve billion, seven hundred eighty-one million, eight hundred six thousand, two hundred fifty-six".