16666247 has 8 divisors (see below), whose sum is σ = 18330816. Its totient is φ = 15056352.

The previous prime is 16666231. The next prime is 16666267. The reversal of 16666247 is 74266661.

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

It is a cyclic number.

It is not a de Polignac number, because 16666247 - 2⁴ = 16666231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16666247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666207) 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, 13028 + ... + 14249.

It is an arithmetic number, because the mean of its divisors is an integer number (2291352).

Almost surely, 2^16666247 is an apocalyptic number.

16666247 is a deficient number, since it is larger than the sum of its proper divisors (1664569).

16666247 is a wasteful number, since it uses less digits than its factorization.

16666247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27337.

The product of its digits is 72576, while the sum is 38.

The square root of 16666247 is about 4082.4315058553. The cubic root of 16666247 is about 255.4343334830.

The spelling of 16666247 in words is "sixteen million, six hundred sixty-six thousand, two hundred forty-seven".