16605561600 has 216 divisors, whose sum is σ = 60891536720. Its totient is φ = 4428103680.

The previous prime is 16605561569. The next prime is 16605561611. The reversal of 16605561600 is 616550661.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124752 + ... + 220848.

Almost surely, 2^16605561600 is an apocalyptic number.

16605561600 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 16605561600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30445768360).

16605561600 is an abundant number, since it is smaller than the sum of its proper divisors (44285975120).

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

16605561600 is an equidigital number, since it uses as much as digits as its factorization.

16605561600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96132 (or 96107 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 16605561600 in words is "sixteen billion, six hundred five million, five hundred sixty-one thousand, six hundred".