666543241 has 8 divisors (see below), whose sum is σ = 820361024. Its totient is φ = 527374800.

The previous prime is 666543239. The next prime is 666543247. The reversal of 666543241 is 142345666.

666543241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666543241 - 2¹ = 666543239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666543241.

It is not an unprimeable number, because it can be changed into a prime (666543247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3662235 + ... + 3662416.

It is an arithmetic number, because the mean of its divisors is an integer number (102545128).

Almost surely, 2^666543241 is an apocalyptic number.

It is an amenable number.

666543241 is a deficient number, since it is larger than the sum of its proper divisors (153817783).

666543241 is a wasteful number, since it uses less digits than its factorization.

666543241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7324671.

The product of its digits is 103680, while the sum is 37.

The square root of 666543241 is about 25817.4987363222. The cubic root of 666543241 is about 873.5265502833.

The spelling of 666543241 in words is "six hundred sixty-six million, five hundred forty-three thousand, two hundred forty-one".