666666444467 has 2 divisors, whose sum is σ = 666666444468. Its totient is φ = 666666444466.

The previous prime is 666666444403. The next prime is 666666444473. The reversal of 666666444467 is 764444666666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666666444467 - 2⁶ = 666666444403 is a prime.

It is not a weakly prime, because it can be changed into another prime (666666444497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333333222233 + 333333222234.

It is an arithmetic number, because the mean of its divisors is an integer number (333333222234).

Almost surely, 2^666666444467 is an apocalyptic number.

666666444467 is a deficient number, since it is larger than the sum of its proper divisors (1).

666666444467 is an equidigital number, since it uses as much as digits as its factorization.

666666444467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 501645312, while the sum is 65.

The spelling of 666666444467 in words is "six hundred sixty-six billion, six hundred sixty-six million, four hundred forty-four thousand, four hundred sixty-seven".