18664073 has 2 divisors, whose sum is σ = 18664074. Its totient is φ = 18664072.

The previous prime is 18664069. The next prime is 18664153. The reversal of 18664073 is 37046681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10061584 + 8602489 = 3172^2 + 2933^2 .

It is a cyclic number.

It is not a de Polignac number, because 18664073 - 2² = 18664069 is a prime.

It is not a weakly prime, because it can be changed into another prime (18664273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332036 + 9332037.

It is an arithmetic number, because the mean of its divisors is an integer number (9332037).

Almost surely, 2^18664073 is an apocalyptic number.

It is an amenable number.

18664073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18664073 is an equidigital number, since it uses as much as digits as its factorization.

18664073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 18664073 is about 4320.1936299198. The cubic root of 18664073 is about 265.2581938287.

The spelling of 18664073 in words is "eighteen million, six hundred sixty-four thousand, seventy-three".