18066823 has 2 divisors, whose sum is σ = 18066824. Its totient is φ = 18066822.

The previous prime is 18066821. The next prime is 18066827. The reversal of 18066823 is 32866081.

It is a weak prime.

It is an emirp because it is prime and its reverse (32866081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18066823 - 2¹ = 18066821 is a prime.

Together with 18066821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18066821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9033411 + 9033412.

It is an arithmetic number, because the mean of its divisors is an integer number (9033412).

Almost surely, 2^18066823 is an apocalyptic number.

18066823 is a deficient number, since it is larger than the sum of its proper divisors (1).

18066823 is an equidigital number, since it uses as much as digits as its factorization.

18066823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 18066823 is about 4250.5085578081. The cubic root of 18066823 is about 262.3980459697.

The spelling of 18066823 in words is "eighteen million, sixty-six thousand, eight hundred twenty-three".