12643064544 has 96 divisors (see below), whose sum is σ = 36313595136. Its totient is φ = 3819755520.

The previous prime is 12643064537. The next prime is 12643064573. The reversal of 12643064544 is 44546034621.

It is a tau number, because it is divible by the number of its divisors (96).

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, 338109 + ... + 373635.

It is an arithmetic number, because the mean of its divisors is an integer number (378266616).

Almost surely, 2^12643064544 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 12643064544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18156797568).

12643064544 is an abundant number, since it is smaller than the sum of its proper divisors (23670530592).

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

12643064544 is a wasteful number, since it uses less digits than its factorization.

12643064544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35888 (or 35880 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 12643064544 in words is "twelve billion, six hundred forty-three million, sixty-four thousand, five hundred forty-four".