666630043 has 4 divisors (see below), whose sum is σ = 666681840. Its totient is φ = 666578248.

The previous prime is 666630031. The next prime is 666630077. The reversal of 666630043 is 340036666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 666630043 - 2⁵ = 666630011 is a prime.

It is a super-2 number, since 2×666630043² = 888791228460363698, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666629990 and 666630008.

It is not an unprimeable number, because it can be changed into a prime (666640043) 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, 9921 + ... + 37837.

It is an arithmetic number, because the mean of its divisors is an integer number (166670460).

Almost surely, 2^666630043 is an apocalyptic number.

666630043 is a deficient number, since it is larger than the sum of its proper divisors (51797).

666630043 is a wasteful number, since it uses less digits than its factorization.

666630043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51796.

The product of its (nonzero) digits is 46656, while the sum is 34.

The square root of 666630043 is about 25819.1797507202. The cubic root of 666630043 is about 873.5644675835.

The spelling of 666630043 in words is "six hundred sixty-six million, six hundred thirty thousand, forty-three".