12256981840 has 40 divisors (see below), whose sum is σ = 28840841568. Its totient is φ = 4843720320.

The previous prime is 12256981831. The next prime is 12256981859. The reversal of 12256981840 is 4818965221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 916326 + ... + 929605.

Almost surely, 2^12256981840 is an apocalyptic number.

12256981840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12256981840 is an abundant number, since it is smaller than the sum of its proper divisors (16583859728).

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

12256981840 is a wasteful number, since it uses less digits than its factorization.

12256981840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846027 (or 1846021 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 12256981840 in words is "twelve billion, two hundred fifty-six million, nine hundred eighty-one thousand, eight hundred forty".