243666143 has 4 divisors (see below), whose sum is σ = 278475600. Its totient is φ = 208856688.

The previous prime is 243666139. The next prime is 243666187. The reversal of 243666143 is 341666342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243666143 - 2² = 243666139 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 (243666103) 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, 17404718 + ... + 17404731.

It is an arithmetic number, because the mean of its divisors is an integer number (69618900).

Almost surely, 2^243666143 is an apocalyptic number.

243666143 is a deficient number, since it is larger than the sum of its proper divisors (34809457).

243666143 is an equidigital number, since it uses as much as digits as its factorization.

243666143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34809456.

The product of its digits is 62208, while the sum is 35.

The square root of 243666143 is about 15609.8091916589. The cubic root of 243666143 is about 624.5948461106.

The spelling of 243666143 in words is "two hundred forty-three million, six hundred sixty-six thousand, one hundred forty-three".