16664866 has 8 divisors (see below), whose sum is σ = 25018524. Its totient is φ = 8325360.

The previous prime is 16664861. The next prime is 16664867. The reversal of 16664866 is 66846661.

16664866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16443025 + 221841 = 4055^2 + 471^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (16664861) 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, 196 + ... + 5776.

Almost surely, 2^16664866 is an apocalyptic number.

16664866 is a deficient number, since it is larger than the sum of its proper divisors (8353658).

16664866 is a wasteful number, since it uses less digits than its factorization.

16664866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7076.

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

The square root of 16664866 is about 4082.2623629551. The cubic root of 16664866 is about 255.4272780142.

The spelling of 16664866 in words is "sixteen million, six hundred sixty-four thousand, eight hundred sixty-six".