12013535644 has 48 divisors (see below), whose sum is σ = 23134860000. Its totient is φ = 5413248000.

The previous prime is 12013535629. The next prime is 12013535647. The reversal of 12013535644 is 44653531021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12013535647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3938632 + ... + 3941680.

It is an arithmetic number, because the mean of its divisors is an integer number (481976250).

Almost surely, 2^12013535644 is an apocalyptic number.

It is an amenable number.

12013535644 is a deficient number, since it is larger than the sum of its proper divisors (11121324356).

12013535644 is a wasteful number, since it uses less digits than its factorization.

12013535644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814 (or 3812 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 12013535644 in words is "twelve billion, thirteen million, five hundred thirty-five thousand, six hundred forty-four".