16616809 has 12 divisors (see below), whose sum is σ = 18385920. Its totient is φ = 15006200.

The previous prime is 16616801. The next prime is 16616839. The reversal of 16616809 is 90861661.

It is not a de Polignac number, because 16616809 - 2³ = 16616801 is a prime.

It is a super-2 number, since 2×16616809² = 552236682684962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16616801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22752 + ... + 23470.

It is an arithmetic number, because the mean of its divisors is an integer number (1532160).

Almost surely, 2^16616809 is an apocalyptic number.

It is an amenable number.

16616809 is a deficient number, since it is larger than the sum of its proper divisors (1769111).

16616809 is a wasteful number, since it uses less digits than its factorization.

16616809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 16616809 is about 4076.3720389582. The cubic root of 16616809 is about 255.1815137224.

The spelling of 16616809 in words is "sixteen million, six hundred sixteen thousand, eight hundred nine".