16561184056 has 8 divisors (see below), whose sum is σ = 31052220120. Its totient is φ = 8280592024.

The previous prime is 16561183993. The next prime is 16561184071. The reversal of 16561184056 is 65048116561.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×16561184056² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1035073996 + ... + 1035074011.

It is an arithmetic number, because the mean of its divisors is an integer number (3881527515).

Almost surely, 2^16561184056 is an apocalyptic number.

It is an amenable number.

16561184056 is a deficient number, since it is larger than the sum of its proper divisors (14491036064).

16561184056 is a wasteful number, since it uses less digits than its factorization.

16561184056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070148013 (or 2070148009 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 16561184056 in words is "sixteen billion, five hundred sixty-one million, one hundred eighty-four thousand, fifty-six".