16656999844 has 27 divisors (see below), whose sum is σ = 29804860897. Its totient is φ = 8145360944.

The previous prime is 16656999761. The next prime is 16656999869. The reversal of 16656999844 is 44899965661.

The square root of 16656999844 is 129062.

It is a perfect power (a square), and thus also a powerful number.

16656999844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 16463456100 + 193543744 = 128310^2 + 13912^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16656999844.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 12131142 + ... + 12132514.

Almost surely, 2^16656999844 is an apocalyptic number.

16656999844 is the 129062-nd square number.

It is an amenable number.

16656999844 is a deficient number, since it is larger than the sum of its proper divisors (13147861053).

16656999844 is an frugal number, since it uses more digits than its factorization.

16656999844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844 (or 1422 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 67.

The spelling of 16656999844 in words is "sixteen billion, six hundred fifty-six million, nine hundred ninety-nine thousand, eight hundred forty-four".