18666023 has 2 divisors, whose sum is σ = 18666024. Its totient is φ = 18666022.

The previous prime is 18665993. The next prime is 18666047. The reversal of 18666023 is 32066681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18666023 - 2¹⁰ = 18664999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18666073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9333011 + 9333012.

It is an arithmetic number, because the mean of its divisors is an integer number (9333012).

Almost surely, 2^18666023 is an apocalyptic number.

18666023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18666023 is an equidigital number, since it uses as much as digits as its factorization.

18666023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 18666023 is about 4320.4193083542. The cubic root of 18666023 is about 265.2674314598.

The spelling of 18666023 in words is "eighteen million, six hundred sixty-six thousand, twenty-three".