12640138752 has 80 divisors (see below), whose sum is σ = 34309701360. Its totient is φ = 4133855232.

The previous prime is 12640138751. The next prime is 12640138799. The reversal of 12640138752 is 25783104621.

It is a self number, because there is not a number n which added to its sum of digits gives 12640138752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640138751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3774 + ... + 159042.

It is an arithmetic number, because the mean of its divisors is an integer number (428871267).

Almost surely, 2^12640138752 is an apocalyptic number.

12640138752 is a gapful number since it is divisible by the number (12) 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 12640138752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17154850680).

12640138752 is an abundant number, since it is smaller than the sum of its proper divisors (21669562608).

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

12640138752 is an equidigital number, since it uses as much as digits as its factorization.

12640138752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155343 (or 155327 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 12640138752 in words is "twelve billion, six hundred forty million, one hundred thirty-eight thousand, seven hundred fifty-two".