666330443 has 4 divisors (see below), whose sum is σ = 667848720. Its totient is φ = 664812168.

The previous prime is 666330439. The next prime is 666330499. The reversal of 666330443 is 344033666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666330443 - 2² = 666330439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666330403) 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, 758480 + ... + 759357.

It is an arithmetic number, because the mean of its divisors is an integer number (166962180).

Almost surely, 2^666330443 is an apocalyptic number.

666330443 is a deficient number, since it is larger than the sum of its proper divisors (1518277).

666330443 is a wasteful number, since it uses less digits than its factorization.

666330443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518276.

The product of its (nonzero) digits is 93312, while the sum is 35.

The square root of 666330443 is about 25813.3772102761. The cubic root of 666330443 is about 873.4335808271.

The spelling of 666330443 in words is "six hundred sixty-six million, three hundred thirty thousand, four hundred forty-three".