16666506 has 16 divisors (see below), whose sum is σ = 37036800. Its totient is φ = 5555484.

The previous prime is 16666501. The next prime is 16666523. The reversal of 16666506 is 60566661.

It is not an unprimeable number, because it can be changed into a prime (16666501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154266 + ... + 154373.

It is an arithmetic number, because the mean of its divisors is an integer number (2314800).

Almost surely, 2^16666506 is an apocalyptic number.

16666506 is an abundant number, since it is smaller than the sum of its proper divisors (20370294).

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

16666506 is a wasteful number, since it uses less digits than its factorization.

16666506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308650 (or 308644 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 16666506 is about 4082.4632270236. The cubic root of 16666506 is about 255.4356566593.

The spelling of 16666506 in words is "sixteen million, six hundred sixty-six thousand, five hundred six".