12543174520 has 128 divisors (see below), whose sum is σ = 30285676800. Its totient is φ = 4661369856.

The previous prime is 12543174517. The next prime is 12543174613. The reversal of 12543174520 is 2547134521.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 15937567 + ... + 15938353.

It is an arithmetic number, because the mean of its divisors is an integer number (236606850).

Almost surely, 2^12543174520 is an apocalyptic number.

12543174520 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 12543174520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15142838400).

12543174520 is an abundant number, since it is smaller than the sum of its proper divisors (17742502280).

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

12543174520 is a wasteful number, since it uses less digits than its factorization.

12543174520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 1193 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 12543174520 in words is "twelve billion, five hundred forty-three million, one hundred seventy-four thousand, five hundred twenty".