12603543440 has 80 divisors (see below), whose sum is σ = 29884837248. Its totient is φ = 4942199808.

The previous prime is 12603543439. The next prime is 12603543493. The reversal of 12603543440 is 4434530621.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 12603543397 and 12603543406.

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, 968819 + ... + 981741.

Almost surely, 2^12603543440 is an apocalyptic number.

12603543440 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 12603543440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14942418624).

12603543440 is an abundant number, since it is smaller than the sum of its proper divisors (17281293808).

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

12603543440 is a wasteful number, since it uses less digits than its factorization.

12603543440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13176 (or 13170 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The spelling of 12603543440 in words is "twelve billion, six hundred three million, five hundred forty-three thousand, four hundred forty".