12117408856 has 16 divisors (see below), whose sum is σ = 25965876240. Its totient is φ = 5193175200.

The previous prime is 12117408833. The next prime is 12117408881. The reversal of 12117408856 is 65880471121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108191095 + ... + 108191206.

It is an arithmetic number, because the mean of its divisors is an integer number (1622867265).

Almost surely, 2^12117408856 is an apocalyptic number.

It is an amenable number.

12117408856 is an abundant number, since it is smaller than the sum of its proper divisors (13848467384).

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

12117408856 is a wasteful number, since it uses less digits than its factorization.

12117408856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216382314 (or 216382310 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

Adding to 12117408856 its reverse (65880471121), we get a palindrome (77997879977).

The spelling of 12117408856 in words is "twelve billion, one hundred seventeen million, four hundred eight thousand, eight hundred fifty-six".