16644040021136 has 40 divisors (see below), whose sum is σ = 35927947142784. Its totient is φ = 7404505228160.

The previous prime is 16644040021111. The next prime is 16644040021171. The reversal of 16644040021136 is 63112004044661.

16644040021136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 16644040021136.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006038635 + ... + 1006055178.

Almost surely, 2^{16644040021136} is an apocalyptic number.

16644040021136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16644040021136 is an abundant number, since it is smaller than the sum of its proper divisors (19283907121648).

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

16644040021136 is a wasteful number, since it uses less digits than its factorization.

16644040021136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012093879 (or 2012093873 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

Adding to 16644040021136 its reverse (63112004044661), we get a palindrome (79756044065797).

The spelling of 16644040021136 in words is "sixteen trillion, six hundred forty-four billion, forty million, twenty-one thousand, one hundred thirty-six".