12668538770512 has 80 divisors (see below), whose sum is σ = 26397994348800. Its totient is φ = 5870734087680.

The previous prime is 12668538770501. The next prime is 12668538770513. The reversal of 12668538770512 is 21507783586621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12668538770513) 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, 33948462 + ... + 34319602.

It is an arithmetic number, because the mean of its divisors is an integer number (329974929360).

Almost surely, 2^{12668538770512} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12668538770512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13198997174400).

12668538770512 is an abundant number, since it is smaller than the sum of its proper divisors (13729455578288).

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

12668538770512 is a wasteful number, since it uses less digits than its factorization.

12668538770512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373604 (or 373598 counting only the distinct ones).

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 12668538770512 in words is "twelve trillion, six hundred sixty-eight billion, five hundred thirty-eight million, seven hundred seventy thousand, five hundred twelve".