242665666 has 4 divisors (see below), whose sum is σ = 363998502. Its totient is φ = 121332832.

The previous prime is 242665639. The next prime is 242665669. The reversal of 242665666 is 666566242.

242665666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 237006025 + 5659641 = 15395^2 + 2379^2 .

It is not an unprimeable number, because it can be changed into a prime (242665669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60666415 + ... + 60666418.

Almost surely, 2^242665666 is an apocalyptic number.

242665666 is a deficient number, since it is larger than the sum of its proper divisors (121332836).

242665666 is a wasteful number, since it uses less digits than its factorization.

242665666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121332835.

The product of its digits is 622080, while the sum is 43.

The square root of 242665666 is about 15577.7298089292. The cubic root of 242665666 is about 623.7388251325.

The spelling of 242665666 in words is "two hundred forty-two million, six hundred sixty-five thousand, six hundred sixty-six".