242640666 has 12 divisors (see below), whose sum is σ = 525721482. Its totient is φ = 80880216.

The previous prime is 242640653. The next prime is 242640707. The reversal of 242640666 is 666046242.

242640666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 147987225 + 94653441 = 12165^2 + 9729^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 242640666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6740001 + ... + 6740036.

Almost surely, 2^242640666 is an apocalyptic number.

242640666 is an abundant number, since it is smaller than the sum of its proper divisors (283080816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

242640666 is a wasteful number, since it uses less digits than its factorization.

242640666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13480045 (or 13480042 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 242640666 is about 15576.9273606832. The cubic root of 242640666 is about 623.7174047060.

The spelling of 242640666 in words is "two hundred forty-two million, six hundred forty thousand, six hundred sixty-six".