12720120556 has 48 divisors (see below), whose sum is σ = 26173808640. Its totient is φ = 5332633920.

The previous prime is 12720120541. The next prime is 12720120557. The reversal of 12720120556 is 65502102721.

It is not an unprimeable number, because it can be changed into a prime (12720120557) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 722895 + ... + 740281.

It is an arithmetic number, because the mean of its divisors is an integer number (545287680).

Almost surely, 2^12720120556 is an apocalyptic number.

It is an amenable number.

12720120556 is an abundant number, since it is smaller than the sum of its proper divisors (13453688084).

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

12720120556 is a wasteful number, since it uses less digits than its factorization.

12720120556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18694 (or 18692 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 12720120556 in words is "twelve billion, seven hundred twenty million, one hundred twenty thousand, five hundred fifty-six".