16666143 has 16 divisors (see below), whose sum is σ = 24339840. Its totient is φ = 10080864.

The previous prime is 16666141. The next prime is 16666147. The reversal of 16666143 is 34166661.

It is not a de Polignac number, because 16666143 - 2¹ = 16666141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1321 + ... + 5922.

It is an arithmetic number, because the mean of its divisors is an integer number (1521240).

Almost surely, 2^16666143 is an apocalyptic number.

16666143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16666143 is a deficient number, since it is larger than the sum of its proper divisors (7673697).

16666143 is a wasteful number, since it uses less digits than its factorization.

16666143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7318.

The product of its digits is 15552, while the sum is 33.

The square root of 16666143 is about 4082.4187683284. The cubic root of 16666143 is about 255.4338021651.

The spelling of 16666143 in words is "sixteen million, six hundred sixty-six thousand, one hundred forty-three".