16521666560 has 224 divisors, whose sum is σ = 46899941760. Its totient is φ = 5466488832.

The previous prime is 16521666541. The next prime is 16521666571. The reversal of 16521666560 is 6566612561.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8313887 + ... + 8315873.

It is an arithmetic number, because the mean of its divisors is an integer number (209374740).

Almost surely, 2^16521666560 is an apocalyptic number.

16521666560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16521666560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23449970880).

16521666560 is an abundant number, since it is smaller than the sum of its proper divisors (30378275200).

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

16521666560 is an equidigital number, since it uses as much as digits as its factorization.

16521666560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054 (or 2030 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 16521666560 in words is "sixteen billion, five hundred twenty-one million, six hundred sixty-six thousand, five hundred sixty".