243216668 has 12 divisors (see below), whose sum is σ = 431017440. Its totient is φ = 120068832.

The previous prime is 243216661. The next prime is 243216683. The reversal of 243216668 is 866612342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243216661) 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, 384521 + ... + 385152.

It is an arithmetic number, because the mean of its divisors is an integer number (35918120).

Almost surely, 2^243216668 is an apocalyptic number.

It is an amenable number.

243216668 is a deficient number, since it is larger than the sum of its proper divisors (187800772).

243216668 is a wasteful number, since it uses less digits than its factorization.

243216668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769756 (or 769754 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 243216668 is about 15595.4053490123. The cubic root of 243216668 is about 624.2105599683.

The spelling of 243216668 in words is "two hundred forty-three million, two hundred sixteen thousand, six hundred sixty-eight".