666666242241 has 4 divisors (see below), whose sum is σ = 888888322992. Its totient is φ = 444444161492.

The previous prime is 666666242201. The next prime is 666666242261. The reversal of 666666242241 is 142242666666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666666242241 - 2¹³ = 666666234049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666666242201) 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, 111111040371 + ... + 111111040376.

It is an arithmetic number, because the mean of its divisors is an integer number (222222080748).

Almost surely, 2^666666242241 is an apocalyptic number.

It is an amenable number.

666666242241 is a deficient number, since it is larger than the sum of its proper divisors (222222080751).

666666242241 is a wasteful number, since it uses less digits than its factorization.

666666242241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222222080750.

The product of its digits is 5971968, while the sum is 51.

The spelling of 666666242241 in words is "six hundred sixty-six billion, six hundred sixty-six million, two hundred forty-two thousand, two hundred forty-one".