16691603904 has 252 divisors, whose sum is σ = 50232242944. Its totient is φ = 5502422016.

The previous prime is 16691603893. The next prime is 16691603959. The reversal of 16691603904 is 40930619661.

16691603904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 16691603904.

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 35 ways as a sum of consecutive naturals, for example, 53327652 + ... + 53327964.

Almost surely, 2^16691603904 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 16691603904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25116121472).

16691603904 is an abundant number, since it is smaller than the sum of its proper divisors (33540639040).

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

16691603904 is an frugal number, since it uses more digits than its factorization.

16691603904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 16691603904 in words is "sixteen billion, six hundred ninety-one million, six hundred three thousand, nine hundred four".