12387109018556 has 24 divisors (see below), whose sum is σ = 21940690487184. Its totient is φ = 6118354428800.

The previous prime is 12387109018549. The next prime is 12387109018561. The reversal of 12387109018556 is 65581090178321.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1759766 + ... + 5279298.

It is an arithmetic number, because the mean of its divisors is an integer number (914195436966).

Almost surely, 2^{12387109018556} is an apocalyptic number.

It is a pronic number, being equal to 3519532×3519533.

It is an amenable number.

12387109018556 is a deficient number, since it is larger than the sum of its proper divisors (9553581468628).

12387109018556 is a wasteful number, since it uses less digits than its factorization.

12387109018556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3530221 (or 3530219 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 56.

The spelling of 12387109018556 in words is "twelve trillion, three hundred eighty-seven billion, one hundred nine million, eighteen thousand, five hundred fifty-six".