16566939648 has 624 divisors, whose sum is σ = 59971225600. Its totient is φ = 4299816960.

The previous prime is 16566939643. The next prime is 16566939673. The reversal of 16566939648 is 84693966561.

16566939648 is a `hidden beast` number, since 1 + 6 + 566 + 9 + 3 + 9 + 64 + 8 = 666.

16566939648 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 (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566939643) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 151990218 + ... + 151990326.

Almost surely, 2^16566939648 is an apocalyptic number.

16566939648 is a gapful number since it is divisible by the number (18) 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 16566939648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29985612800).

16566939648 is an abundant number, since it is smaller than the sum of its proper divisors (43404285952).

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

16566939648 is a wasteful number, since it uses less digits than its factorization.

16566939648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 171 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 63.

The spelling of 16566939648 in words is "sixteen billion, five hundred sixty-six million, nine hundred thirty-nine thousand, six hundred forty-eight".