18066403 has 2 divisors, whose sum is σ = 18066404. Its totient is φ = 18066402.

The previous prime is 18066383. The next prime is 18066409. The reversal of 18066403 is 30466081.

It is a strong prime.

It is an emirp because it is prime and its reverse (30466081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18066403 is a prime.

It is not a weakly prime, because it can be changed into another prime (18066409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9033201 + 9033202.

It is an arithmetic number, because the mean of its divisors is an integer number (9033202).

Almost surely, 2^18066403 is an apocalyptic number.

18066403 is a deficient number, since it is larger than the sum of its proper divisors (1).

18066403 is an equidigital number, since it uses as much as digits as its factorization.

18066403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 18066403 is about 4250.4591516682. The cubic root of 18066403 is about 262.3960126287.

The spelling of 18066403 in words is "eighteen million, sixty-six thousand, four hundred three".