16561509560 has 16 divisors (see below), whose sum is σ = 37263396600. Its totient is φ = 6624603808.

The previous prime is 16561509551. The next prime is 16561509563. The reversal of 16561509560 is 6590516561.

16561509560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561509563) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 207018830 + ... + 207018909.

Almost surely, 2^16561509560 is an apocalyptic number.

16561509560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16561509560 is an abundant number, since it is smaller than the sum of its proper divisors (20701887040).

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

16561509560 is a wasteful number, since it uses less digits than its factorization.

16561509560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414037750 (or 414037746 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 44.

The spelling of 16561509560 in words is "sixteen billion, five hundred sixty-one million, five hundred nine thousand, five hundred sixty".