16643235544 has 32 divisors (see below), whose sum is σ = 34066912320. Its totient is φ = 7576263936.

The previous prime is 16643235523. The next prime is 16643235559. The reversal of 16643235544 is 44553234661.

It is a happy number.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 16643235544.

It is a congruent number.

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, 1088512 + ... + 1103695.

It is an arithmetic number, because the mean of its divisors is an integer number (1064591010).

Almost surely, 2^16643235544 is an apocalyptic number.

It is an amenable number.

16643235544 is an abundant number, since it is smaller than the sum of its proper divisors (17423676776).

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

16643235544 is a wasteful number, since it uses less digits than its factorization.

16643235544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192299 (or 2192295 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 43.

The spelling of 16643235544 in words is "sixteen billion, six hundred forty-three million, two hundred thirty-five thousand, five hundred forty-four".