666543873 has 16 divisors (see below), whose sum is σ = 900322560. Its totient is φ = 438582144.

The previous prime is 666543833. The next prime is 666543893. The reversal of 666543873 is 378345666.

It is a happy number.

666543873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666543873 - 2¹² = 666539777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666543833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172440 + ... + 176262.

It is an arithmetic number, because the mean of its divisors is an integer number (56270160).

Almost surely, 2^666543873 is an apocalyptic number.

It is an amenable number.

666543873 is a deficient number, since it is larger than the sum of its proper divisors (233778687).

666543873 is a wasteful number, since it uses less digits than its factorization.

666543873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568.

The product of its digits is 2177280, while the sum is 48.

The square root of 666543873 is about 25817.5109760798. The cubic root of 666543873 is about 873.5268263687.

The spelling of 666543873 in words is "six hundred sixty-six million, five hundred forty-three thousand, eight hundred seventy-three".