12543554320 has 160 divisors (see below), whose sum is σ = 32296682880. Its totient is φ = 4492800000.

The previous prime is 12543554293. The next prime is 12543554327. The reversal of 12543554320 is 2345534521.

It is not an unprimeable number, because it can be changed into a prime (12543554327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24075660 + ... + 24076180.

It is an arithmetic number, because the mean of its divisors is an integer number (201854268).

Almost surely, 2^12543554320 is an apocalyptic number.

12543554320 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 12543554320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16148341440).

12543554320 is an abundant number, since it is smaller than the sum of its proper divisors (19753128560).

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

12543554320 is a wasteful number, since it uses less digits than its factorization.

12543554320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The spelling of 12543554320 in words is "twelve billion, five hundred forty-three million, five hundred fifty-four thousand, three hundred twenty".