12443821864 has 8 divisors (see below), whose sum is σ = 23332166010. Its totient is φ = 6221910928.

The previous prime is 12443821853. The next prime is 12443821883. The reversal of 12443821864 is 46812834421.

It can be written as a sum of positive squares in only one way, i.e., 12419319364 + 24502500 = 111442^2 + 4950^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 12443821864.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777738859 + ... + 777738874.

Almost surely, 2^12443821864 is an apocalyptic number.

It is an amenable number.

12443821864 is a deficient number, since it is larger than the sum of its proper divisors (10888344146).

12443821864 is a wasteful number, since it uses less digits than its factorization.

12443821864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555477739 (or 1555477735 counting only the distinct ones).

The product of its digits is 294912, while the sum is 43.

The spelling of 12443821864 in words is "twelve billion, four hundred forty-three million, eight hundred twenty-one thousand, eight hundred sixty-four".