12571443664 has 80 divisors (see below), whose sum is σ = 26802815760. Its totient is φ = 5677056000.

The previous prime is 12571443659. The next prime is 12571443673. The reversal of 12571443664 is 46634417521.

It can be written as a sum of positive squares in 8 ways, for example, as 2142949264 + 10428494400 = 46292^2 + 102120^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12571443664.

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, 1792164 + ... + 1799164.

It is an arithmetic number, because the mean of its divisors is an integer number (335035197).

Almost surely, 2^12571443664 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 12571443664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13401407880).

12571443664 is an abundant number, since it is smaller than the sum of its proper divisors (14231372096).

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

12571443664 is a wasteful number, since it uses less digits than its factorization.

12571443664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7208 (or 7202 counting only the distinct ones).

The product of its digits is 483840, while the sum is 43.

The spelling of 12571443664 in words is "twelve billion, five hundred seventy-one million, four hundred forty-three thousand, six hundred sixty-four".