16516788666 has 64 divisors (see below), whose sum is σ = 38502770688. Its totient is φ = 4625494848.

The previous prime is 16516788653. The next prime is 16516788671. The reversal of 16516788666 is 66688761561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2719365 + ... + 2725431.

It is an arithmetic number, because the mean of its divisors is an integer number (601605792).

Almost surely, 2^16516788666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16516788666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19251385344).

16516788666 is an abundant number, since it is smaller than the sum of its proper divisors (21985982022).

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

16516788666 is a wasteful number, since it uses less digits than its factorization.

16516788666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7355.

The product of its digits is 17418240, while the sum is 60.

The spelling of 16516788666 in words is "sixteen billion, five hundred sixteen million, seven hundred eighty-eight thousand, six hundred sixty-six".