16686664 has 8 divisors (see below), whose sum is σ = 31287510. Its totient is φ = 8343328.

The previous prime is 16686653. The next prime is 16686689. The reversal of 16686664 is 46668661.

It can be written as a sum of positive squares in only one way, i.e., 13264164 + 3422500 = 3642^2 + 1850^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 16686664.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1042909 + ... + 1042924.

Almost surely, 2^16686664 is an apocalyptic number.

It is an amenable number.

16686664 is a deficient number, since it is larger than the sum of its proper divisors (14600846).

16686664 is a wasteful number, since it uses less digits than its factorization.

16686664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085839 (or 2085835 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The square root of 16686664 is about 4084.9313335722. The cubic root of 16686664 is about 255.5385976005.

The spelling of 16686664 in words is "sixteen million, six hundred eighty-six thousand, six hundred sixty-four".