18661327 has 2 divisors, whose sum is σ = 18661328. Its totient is φ = 18661326.

The previous prime is 18661289. The next prime is 18661333. The reversal of 18661327 is 72316681.

It is a strong prime.

It is an emirp because it is prime and its reverse (72316681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18661327 - 2²³ = 10272719 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 18661292 and 18661301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18661387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9330663 + 9330664.

It is an arithmetic number, because the mean of its divisors is an integer number (9330664).

Almost surely, 2^18661327 is an apocalyptic number.

18661327 is a deficient number, since it is larger than the sum of its proper divisors (1).

18661327 is an equidigital number, since it uses as much as digits as its factorization.

18661327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 18661327 is about 4319.8758084001. The cubic root of 18661327 is about 265.2451842581.

The spelling of 18661327 in words is "eighteen million, six hundred sixty-one thousand, three hundred twenty-seven".