16561656156 has 24 divisors (see below), whose sum is σ = 40917033360. Its totient is φ = 5195813632.

The previous prime is 16561656151. The next prime is 16561656229. The reversal of 16561656156 is 65165616561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561656151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40592091 + ... + 40592498.

It is an arithmetic number, because the mean of its divisors is an integer number (1704876390).

Almost surely, 2^16561656156 is an apocalyptic number.

It is an amenable number.

16561656156 is an abundant number, since it is smaller than the sum of its proper divisors (24355377204).

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

16561656156 is a wasteful number, since it uses less digits than its factorization.

16561656156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81184613 (or 81184611 counting only the distinct ones).

The product of its digits is 972000, while the sum is 48.

The spelling of 16561656156 in words is "sixteen billion, five hundred sixty-one million, six hundred fifty-six thousand, one hundred fifty-six".