16580198556 has 96 divisors (see below), whose sum is σ = 43381856000. Its totient is φ = 5475968064.

The previous prime is 16580198521. The next prime is 16580198561. The reversal of 16580198556 is 65589108561.

16580198556 is a `hidden beast` number, since 1 + 6 + 5 + 80 + 1 + 9 + 8 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11363355 + ... + 11364813.

Almost surely, 2^16580198556 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 16580198556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21690928000).

16580198556 is an abundant number, since it is smaller than the sum of its proper divisors (26801657444).

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

16580198556 is a wasteful number, since it uses less digits than its factorization.

16580198556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368 (or 2360 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 54.

The spelling of 16580198556 in words is "sixteen billion, five hundred eighty million, one hundred ninety-eight thousand, five hundred fifty-six".