12547991120 has 80 divisors (see below), whose sum is σ = 33413897088. Its totient is φ = 4292866560.

The previous prime is 12547991089. The next prime is 12547991123. The reversal of 12547991120 is 2119974521.

It is a happy number.

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

It is a super-2 number, since 2×12547991120² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12547991123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237530 + ... + 285510.

Almost surely, 2^12547991120 is an apocalyptic number.

12547991120 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 12547991120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16706948544).

12547991120 is an abundant number, since it is smaller than the sum of its proper divisors (20865905968).

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

12547991120 is a wasteful number, since it uses less digits than its factorization.

12547991120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48468 (or 48462 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 12547991120 in words is "twelve billion, five hundred forty-seven million, nine hundred ninety-one thousand, one hundred twenty".