16555564600 has 96 divisors (see below), whose sum is σ = 38831264640. Its totient is φ = 6564096000.

The previous prime is 16555564583. The next prime is 16555564609. The reversal of 16555564600 is 646555561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555564609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12531940 + ... + 12533260.

It is an arithmetic number, because the mean of its divisors is an integer number (404492340).

Almost surely, 2^16555564600 is an apocalyptic number.

16555564600 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 16555564600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19415632320).

16555564600 is an abundant number, since it is smaller than the sum of its proper divisors (22275700040).

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

16555564600 is a wasteful number, since it uses less digits than its factorization.

16555564600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841 (or 1832 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 16555564600 in words is "sixteen billion, five hundred fifty-five million, five hundred sixty-four thousand, six hundred".