16668143 has 8 divisors (see below), whose sum is σ = 17862768. Its totient is φ = 15497344.

The previous prime is 16668137. The next prime is 16668209. The reversal of 16668143 is 34186661.

16668143 is nontrivially palindromic in base 16.

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 16668143 - 2⁶ = 16668079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16668343) 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, 4496 + ... + 7317.

It is an arithmetic number, because the mean of its divisors is an integer number (2232846).

Almost surely, 2^16668143 is an apocalyptic number.

16668143 is a deficient number, since it is larger than the sum of its proper divisors (1194625).

16668143 is a wasteful number, since it uses less digits than its factorization.

16668143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11913.

The product of its digits is 20736, while the sum is 35.

The square root of 16668143 is about 4082.6637138025. The cubic root of 16668143 is about 255.4440194296. Note that the first 3 decimals are identical.

The spelling of 16668143 in words is "sixteen million, six hundred sixty-eight thousand, one hundred forty-three".