16561830616436 has 48 divisors (see below), whose sum is σ = 33211220313600. Its totient is φ = 7079173435488.

The previous prime is 16561830616423. The next prime is 16561830616451. The reversal of 16561830616436 is 63461603816561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46127375 + ... + 46485033.

It is an arithmetic number, because the mean of its divisors is an integer number (691900423200).

Almost surely, 2^{16561830616436} is an apocalyptic number.

It is an amenable number.

16561830616436 is an abundant number, since it is smaller than the sum of its proper divisors (16649389697164).

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

16561830616436 is a wasteful number, since it uses less digits than its factorization.

16561830616436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362036 (or 362034 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 16561830616436 in words is "sixteen trillion, five hundred sixty-one billion, eight hundred thirty million, six hundred sixteen thousand, four hundred thirty-six".