16656233521 has 16 divisors (see below), whose sum is σ = 17206421760. Its totient is φ = 16115299200.

The previous prime is 16656233507. The next prime is 16656233543. The reversal of 16656233521 is 12533265661.

16656233521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16656233521 - 2²⁷ = 16522015793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16656233621) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4323246 + ... + 4327096.

It is an arithmetic number, because the mean of its divisors is an integer number (1075401360).

Almost surely, 2^16656233521 is an apocalyptic number.

It is an amenable number.

16656233521 is a deficient number, since it is larger than the sum of its proper divisors (550188239).

16656233521 is a wasteful number, since it uses less digits than its factorization.

16656233521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016.

The product of its digits is 194400, while the sum is 40.

The spelling of 16656233521 in words is "sixteen billion, six hundred fifty-six million, two hundred thirty-three thousand, five hundred twenty-one".