16606646784 has 640 divisors, whose sum is σ = 62109358080. Its totient is φ = 4263985152.

The previous prime is 16606646731. The next prime is 16606646807. The reversal of 16606646784 is 48764660661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 16606646784.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54093159 + ... + 54093465.

It is an arithmetic number, because the mean of its divisors is an integer number (97045872).

Almost surely, 2^16606646784 is an apocalyptic number.

16606646784 is a gapful number since it is divisible by the number (14) 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 16606646784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31054679040).

16606646784 is an abundant number, since it is smaller than the sum of its proper divisors (45502711296).

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

16606646784 is a wasteful number, since it uses less digits than its factorization.

16606646784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 16606646784 in words is "sixteen billion, six hundred six million, six hundred forty-six thousand, seven hundred eighty-four".