16656797664 has 192 divisors, whose sum is σ = 53058862080. Its totient is φ = 5052741120.

The previous prime is 16656797629. The next prime is 16656797681. The reversal of 16656797664 is 46679765661.

16656797664 is a `hidden beast` number, since 1 + 6 + 6 + 567 + 9 + 7 + 6 + 64 = 666.

16656797664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 787029 + ... + 807915.

It is an arithmetic number, because the mean of its divisors is an integer number (276348240).

Almost surely, 2^16656797664 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 16656797664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26529431040).

16656797664 is an abundant number, since it is smaller than the sum of its proper divisors (36402064416).

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

16656797664 is a wasteful number, since it uses less digits than its factorization.

16656797664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20990 (or 20976 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 63.

The spelling of 16656797664 in words is "sixteen billion, six hundred fifty-six million, seven hundred ninety-seven thousand, six hundred sixty-four".