16661541600 has 432 divisors, whose sum is σ = 65018588544. Its totient is φ = 3980928000.

The previous prime is 16661541587. The next prime is 16661541629. The reversal of 16661541600 is 614516661.

It is a happy number.

16661541600 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5621719 + ... + 5624681.

It is an arithmetic number, because the mean of its divisors is an integer number (150505992).

Almost surely, 2^16661541600 is an apocalyptic number.

16661541600 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 16661541600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32509294272).

16661541600 is an abundant number, since it is smaller than the sum of its proper divisors (48357046944).

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

16661541600 is a wasteful number, since it uses less digits than its factorization.

16661541600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3071 (or 3055 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 16661541600 in words is "sixteen billion, six hundred sixty-one million, five hundred forty-one thousand, six hundred".