16666998 has 8 divisors (see below), whose sum is σ = 33334008. Its totient is φ = 5555664.

The previous prime is 16666997. The next prime is 16667003. The reversal of 16666998 is 89966661.

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

16666998 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 16666998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666997) 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, 1388911 + ... + 1388922.

It is an arithmetic number, because the mean of its divisors is an integer number (4166751).

Almost surely, 2^16666998 is an apocalyptic number.

16666998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16666998 is a wasteful number, since it uses less digits than its factorization.

16666998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777838.

The product of its digits is 839808, while the sum is 51.

The square root of 16666998 is about 4082.5234843170. The cubic root of 16666998 is about 255.4381701457.

The spelling of 16666998 in words is "sixteen million, six hundred sixty-six thousand, nine hundred ninety-eight".