16638066 has 12 divisors (see below), whose sum is σ = 36049182. Its totient is φ = 5546016.

The previous prime is 16638023. The next prime is 16638077. The reversal of 16638066 is 66083661.

16638066 is a `hidden beast` number, since 16 + 638 + 0 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 65025 = 4071^2 + 255^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 16638066.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 462151 + ... + 462186.

Almost surely, 2^16638066 is an apocalyptic number.

16638066 is an abundant number, since it is smaller than the sum of its proper divisors (19411116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16638066 is a wasteful number, since it uses less digits than its factorization.

16638066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924345 (or 924342 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 16638066 is about 4078.9785486075. The cubic root of 16638066 is about 255.2902807352.

The spelling of 16638066 in words is "sixteen million, six hundred thirty-eight thousand, sixty-six".