16644516812 has 96 divisors (see below), whose sum is σ = 38087884800. Its totient is φ = 6171232320.

The previous prime is 16644516803. The next prime is 16644516821. The reversal of 16644516812 is 21861544661.

It is a happy number.

16644516812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16644516803) and next prime (16644516821).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1403813 + ... + 1415619.

It is an arithmetic number, because the mean of its divisors is an integer number (396748800).

Almost surely, 2^16644516812 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 16644516812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19043942400).

16644516812 is an abundant number, since it is smaller than the sum of its proper divisors (21443367988).

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

16644516812 is a wasteful number, since it uses less digits than its factorization.

16644516812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12051 (or 12049 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The spelling of 16644516812 in words is "sixteen billion, six hundred forty-four million, five hundred sixteen thousand, eight hundred twelve".