16643444332 has 24 divisors (see below), whose sum is σ = 29342380032. Its totient is φ = 8260098000.

The previous prime is 16643444309. The next prime is 16643444357. The reversal of 16643444332 is 23344434661.

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, 330207 + ... + 377257.

It is an arithmetic number, because the mean of its divisors is an integer number (1222599168).

Almost surely, 2^16643444332 is an apocalyptic number.

It is an amenable number.

16643444332 is a deficient number, since it is larger than the sum of its proper divisors (12698935700).

16643444332 is a wasteful number, since it uses less digits than its factorization.

16643444332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47709 (or 47707 counting only the distinct ones).

The product of its digits is 497664, while the sum is 40.

Adding to 16643444332 its reverse (23344434661), we get a palindrome (39987878993).

The spelling of 16643444332 in words is "sixteen billion, six hundred forty-three million, four hundred forty-four thousand, three hundred thirty-two".