16691816 has 16 divisors (see below), whose sum is σ = 31739040. Its totient is φ = 8228080.

The previous prime is 16691809. The next prime is 16691819. The reversal of 16691816 is 61819661.

It is a self number, because there is not a number n which added to its sum of digits gives 16691816.

It is not an unprimeable number, because it can be changed into a prime (16691819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14126 + ... + 15261.

It is an arithmetic number, because the mean of its divisors is an integer number (1983690).

Almost surely, 2^16691816 is an apocalyptic number.

It is an amenable number.

16691816 is a deficient number, since it is larger than the sum of its proper divisors (15047224).

16691816 is a wasteful number, since it uses less digits than its factorization.

16691816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29464 (or 29460 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 16691816 is about 4085.5618952599. The cubic root of 16691816 is about 255.5648940367.

The spelling of 16691816 in words is "sixteen million, six hundred ninety-one thousand, eight hundred sixteen".