12543817920 has 112 divisors (see below), whose sum is σ = 40213605120. Its totient is φ = 3312516096.

The previous prime is 12543817919. The next prime is 12543817969. The reversal of 12543817920 is 2971834521.

It is a super-2 number, since 2×12543817920² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35451 + ... + 162309.

Almost surely, 2^12543817920 is an apocalyptic number.

12543817920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12543817920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20106802560).

12543817920 is an abundant number, since it is smaller than the sum of its proper divisors (27669787200).

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

12543817920 is a wasteful number, since it uses less digits than its factorization.

12543817920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126982 (or 126972 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 12543817920 in words is "twelve billion, five hundred forty-three million, eight hundred seventeen thousand, nine hundred twenty".