12643124720 has 20 divisors (see below), whose sum is σ = 29395265160. Its totient is φ = 5057249856.

The previous prime is 12643124717. The next prime is 12643124729. The reversal of 12643124720 is 2742134621.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643124729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79019450 + ... + 79019609.

It is an arithmetic number, because the mean of its divisors is an integer number (1469763258).

Almost surely, 2^12643124720 is an apocalyptic number.

12643124720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643124720 is an abundant number, since it is smaller than the sum of its proper divisors (16752140440).

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

12643124720 is a wasteful number, since it uses less digits than its factorization.

12643124720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158039072 (or 158039066 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

Subtracting from 12643124720 its reverse (2742134621), we obtain a palindrome (9900990099).

It can be divided in two parts, 126431 and 24720, that added together give a palindrome (151151).

The spelling of 12643124720 in words is "twelve billion, six hundred forty-three million, one hundred twenty-four thousand, seven hundred twenty".