243043666 has 4 divisors (see below), whose sum is σ = 364565502. Its totient is φ = 121521832.

The previous prime is 243043663. The next prime is 243043667. The reversal of 243043666 is 666340342.

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

It can be written as a sum of positive squares in only one way, i.e., 182655225 + 60388441 = 13515^2 + 7771^2 .

It is not an unprimeable number, because it can be changed into a prime (243043663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60760915 + ... + 60760918.

Almost surely, 2^243043666 is an apocalyptic number.

243043666 is a deficient number, since it is larger than the sum of its proper divisors (121521836).

243043666 is a wasteful number, since it uses less digits than its factorization.

243043666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121521835.

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 243043666 is about 15589.8577928088. The cubic root of 243043666 is about 624.0625228416.

The spelling of 243043666 in words is "two hundred forty-three million, forty-three thousand, six hundred sixty-six".