12547645440 has 224 divisors, whose sum is σ = 43804734336. Its totient is φ = 3041525760.

The previous prime is 12547645427. The next prime is 12547645477. The reversal of 12547645440 is 4454674521.

It is a junction number, because it is equal to n+sod(n) for n = 12547645392 and 12547645401.

It is a congruent number.

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, 1347039 + ... + 1356321.

Almost surely, 2^12547645440 is an apocalyptic number.

12547645440 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 12547645440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21902367168).

12547645440 is an abundant number, since it is smaller than the sum of its proper divisors (31257088896).

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

12547645440 is an equidigital number, since it uses as much as digits as its factorization.

12547645440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9328 (or 9304 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 42.

The spelling of 12547645440 in words is "twelve billion, five hundred forty-seven million, six hundred forty-five thousand, four hundred forty".