666023 has 2 divisors, whose sum is σ = 666024. Its totient is φ = 666022.

The previous prime is 666019. The next prime is 666031. The reversal of 666023 is 320666.

666023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666023 - 2² = 666019 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 666023.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666023.

It is not a weakly prime, because it can be changed into another prime (666013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333011 + 333012.

It is an arithmetic number, because the mean of its divisors is an integer number (333012).

2⁶⁶⁶⁰²³ is an apocalyptic number.

666023 is a deficient number, since it is larger than the sum of its proper divisors (1).

666023 is an equidigital number, since it uses as much as digits as its factorization.

666023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 666023 is about 816.1023220161. The cubic root of 666023 is about 87.3299226892.

Adding to 666023 its reverse (320666), we get a palindrome (986689).

The spelling of 666023 in words is "six hundred sixty-six thousand, twenty-three".