16644332784538 has 8 divisors (see below), whose sum is σ = 26051999141088. Its totient is φ = 7960333070844.

The previous prime is 16644332784533. The next prime is 16644332784539. The reversal of 16644332784538 is 83548723344661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16644332784538.

It is not an unprimeable number, because it can be changed into a prime (16644332784533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180916660656 + ... + 180916660747.

It is an arithmetic number, because the mean of its divisors is an integer number (3256499892636).

Almost surely, 2^{16644332784538} is an apocalyptic number.

16644332784538 is a deficient number, since it is larger than the sum of its proper divisors (9407666356550).

16644332784538 is a wasteful number, since it uses less digits than its factorization.

16644332784538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361833321428.

The product of its digits is 278691840, while the sum is 64.

The spelling of 16644332784538 in words is "sixteen trillion, six hundred forty-four billion, three hundred thirty-two million, seven hundred eighty-four thousand, five hundred thirty-eight".