666432443 has 2 divisors, whose sum is σ = 666432444. Its totient is φ = 666432442.

The previous prime is 666432433. The next prime is 666432523. The reversal of 666432443 is 344234666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666432443 - 2⁶ = 666432379 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 666432397 and 666432406.

It is not a weakly prime, because it can be changed into another prime (666432433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333216221 + 333216222.

It is an arithmetic number, because the mean of its divisors is an integer number (333216222).

Almost surely, 2^666432443 is an apocalyptic number.

666432443 is a deficient number, since it is larger than the sum of its proper divisors (1).

666432443 is an equidigital number, since it uses as much as digits as its factorization.

666432443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 38.

The square root of 666432443 is about 25815.3528544547. The cubic root of 666432443 is about 873.4781461429.

The spelling of 666432443 in words is "six hundred sixty-six million, four hundred thirty-two thousand, four hundred forty-three".