16442660646 has 48 divisors (see below), whose sum is σ = 35997665184. Its totient is φ = 5423749632.

The previous prime is 16442660603. The next prime is 16442660659. The reversal of 16442660646 is 64606624461.

16442660646 is a `hidden beast` number, since 16 + 4 + 4 + 26 + 606 + 4 + 6 = 666.

16442660646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×16442660646³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 3737320 + ... + 3741716.

It is an arithmetic number, because the mean of its divisors is an integer number (749951358).

Almost surely, 2^16442660646 is an apocalyptic number.

16442660646 is an abundant number, since it is smaller than the sum of its proper divisors (19555004538).

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

16442660646 is a wasteful number, since it uses less digits than its factorization.

16442660646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6525 (or 6522 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 45.

The spelling of 16442660646 in words is "sixteen billion, four hundred forty-two million, six hundred sixty thousand, six hundred forty-six".