16616393728 has 132 divisors (see below), whose sum is σ = 37145926440. Its totient is φ = 7421624320.

The previous prime is 16616393707. The next prime is 16616393747. The reversal of 16616393728 is 82739361661.

It is a happy number.

It is a super-2 number, since 2×16616393728² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7309200 + ... + 7311472.

Almost surely, 2^16616393728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16616393728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18572963220).

16616393728 is an abundant number, since it is smaller than the sum of its proper divisors (20529532712).

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

16616393728 is a wasteful number, since it uses less digits than its factorization.

16616393728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374 (or 2345 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 52.

The spelling of 16616393728 in words is "sixteen billion, six hundred sixteen million, three hundred ninety-three thousand, seven hundred twenty-eight".