666442067 has 2 divisors, whose sum is σ = 666442068. Its totient is φ = 666442066.

The previous prime is 666442027. The next prime is 666442151. The reversal of 666442067 is 760244666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666442067 - 2¹² = 666437971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666442027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333221033 + 333221034.

It is an arithmetic number, because the mean of its divisors is an integer number (333221034).

Almost surely, 2^666442067 is an apocalyptic number.

666442067 is a deficient number, since it is larger than the sum of its proper divisors (1).

666442067 is an equidigital number, since it uses as much as digits as its factorization.

666442067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 666442067 is about 25815.5392544878. The cubic root of 666442067 is about 873.4823507767.

The spelling of 666442067 in words is "six hundred sixty-six million, four hundred forty-two thousand, sixty-seven".