666406323 has 48 divisors (see below), whose sum is σ = 1110220800. Its totient is φ = 380946240.

The previous prime is 666406291. The next prime is 666406331. The reversal of 666406323 is 323604666.

It is not a de Polignac number, because 666406323 - 2⁵ = 666406291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666406423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 520398 + ... + 521676.

It is an arithmetic number, because the mean of its divisors is an integer number (23129600).

Almost surely, 2^666406323 is an apocalyptic number.

666406323 is a deficient number, since it is larger than the sum of its proper divisors (443814477).

666406323 is a wasteful number, since it uses less digits than its factorization.

666406323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The square root of 666406323 is about 25814.8469489943. The cubic root of 666406323 is about 873.4667343599.

The spelling of 666406323 in words is "six hundred sixty-six million, four hundred six thousand, three hundred twenty-three".