666666444423 has 16 divisors (see below), whose sum is σ = 1027286979840. Its totient is φ = 376671890496.

The previous prime is 666666444403. The next prime is 666666444467. The reversal of 666666444423 is 324444666666.

It is a happy number.

666666444423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666666444423 - 2⁸ = 666666444167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666444403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178346565 + ... + 178350302.

It is an arithmetic number, because the mean of its divisors is an integer number (64205436240).

Almost surely, 2^666666444423 is an apocalyptic number.

666666444423 is a deficient number, since it is larger than the sum of its proper divisors (360620535417).

666666444423 is a wasteful number, since it uses less digits than its factorization.

666666444423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356696966.

The product of its digits is 71663616, while the sum is 57.

The spelling of 666666444423 in words is "six hundred sixty-six billion, six hundred sixty-six million, four hundred forty-four thousand, four hundred twenty-three".