16658807328 has 120 divisors (see below), whose sum is σ = 50682735180. Its totient is φ = 5361431040.

The previous prime is 16658807309. The next prime is 16658807329. The reversal of 16658807328 is 82370885661.

It can be written as a sum of positive squares in 2 ways, for example, as 16637904144 + 20903184 = 128988^2 + 4572^2 .

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

It is not an unprimeable number, because it can be changed into a prime (16658807329) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35643 + ... + 185978.

Almost surely, 2^16658807328 is an apocalyptic number.

16658807328 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 16658807328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25341367590).

16658807328 is an abundant number, since it is smaller than the sum of its proper divisors (34023927852).

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

16658807328 is a wasteful number, since it uses less digits than its factorization.

16658807328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221672 (or 221655 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 16658807328 in words is "sixteen billion, six hundred fifty-eight million, eight hundred seven thousand, three hundred twenty-eight".