16644801600 has 504 divisors, whose sum is σ = 68744681408. Its totient is φ = 3740774400.

The previous prime is 16644801599. The next prime is 16644801631. The reversal of 16644801600 is 610844661.

16644801600 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 48 + 0 + 1 + 600 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6147447 + ... + 6150153.

Almost surely, 2^16644801600 is an apocalyptic number.

16644801600 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 16644801600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34372340704).

16644801600 is an abundant number, since it is smaller than the sum of its proper divisors (52099879808).

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

16644801600 is a wasteful number, since it uses less digits than its factorization.

16644801600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 16644801600 in words is "sixteen billion, six hundred forty-four million, eight hundred one thousand, six hundred".