16688668 has 6 divisors (see below), whose sum is σ = 29205176. Its totient is φ = 8344332.

The previous prime is 16688647. The next prime is 16688677. The reversal of 16688668 is 86688661.

It is a super-2 number, since 2×16688668² = 557023279228448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2086080 + ... + 2086087.

Almost surely, 2^16688668 is an apocalyptic number.

It is an amenable number.

16688668 is a deficient number, since it is larger than the sum of its proper divisors (12516508).

16688668 is a wasteful number, since it uses less digits than its factorization.

16688668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172171 (or 4172169 counting only the distinct ones).

The product of its digits is 663552, while the sum is 49.

The square root of 16688668 is about 4085.1766179689. The cubic root of 16688668 is about 255.5488269040.

The spelling of 16688668 in words is "sixteen million, six hundred eighty-eight thousand, six hundred sixty-eight".