16643143 has 4 divisors (see below), whose sum is σ = 18156168. Its totient is φ = 15130120.

The previous prime is 16643117. The next prime is 16643177. The reversal of 16643143 is 34134661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34134661 = 11 ⋅3103151.

It is a cyclic number.

It is not a de Polignac number, because 16643143 - 2⁹ = 16642631 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 (16647143) 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, 756496 + ... + 756517.

It is an arithmetic number, because the mean of its divisors is an integer number (4539042).

Almost surely, 2^16643143 is an apocalyptic number.

16643143 is a deficient number, since it is larger than the sum of its proper divisors (1513025).

16643143 is a wasteful number, since it uses less digits than its factorization.

16643143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513024.

The product of its digits is 5184, while the sum is 28.

The square root of 16643143 is about 4079.6008383174. The cubic root of 16643143 is about 255.3162448295.

The spelling of 16643143 in words is "sixteen million, six hundred forty-three thousand, one hundred forty-three".