16691606416 has 15 divisors (see below), whose sum is σ = 32340988731. Its totient is φ = 8345544816.

The previous prime is 16691606401. The next prime is 16691606423. The reversal of 16691606416 is 61460619661.

It is a happy number.

The square root of 16691606416 is 129196.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 500635 + ... + 532933.

Almost surely, 2^16691606416 is an apocalyptic number.

16691606416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

16691606416 is the 129196-th square number.

It is an amenable number.

16691606416 is a deficient number, since it is larger than the sum of its proper divisors (15649382315).

16691606416 is an frugal number, since it uses more digits than its factorization.

16691606416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64606 (or 32301 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 16691606416 in words is "sixteen billion, six hundred ninety-one million, six hundred six thousand, four hundred sixteen".