18666989459 has 2 divisors, whose sum is σ = 18666989460. Its totient is φ = 18666989458.

The previous prime is 18666989447. The next prime is 18666989477. The reversal of 18666989459 is 95498966681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18666989459 - 2⁸ = 18666989203 is a prime.

It is a super-2 number, since 2×18666989459² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18666989392 and 18666989401.

It is not a weakly prime, because it can be changed into another prime (18666989659) 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, 9333494729 + 9333494730.

It is an arithmetic number, because the mean of its divisors is an integer number (9333494730).

Almost surely, 2^18666989459 is an apocalyptic number.

18666989459 is a deficient number, since it is larger than the sum of its proper divisors (1).

18666989459 is an equidigital number, since it uses as much as digits as its factorization.

18666989459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201553920, while the sum is 71.

The spelling of 18666989459 in words is "eighteen billion, six hundred sixty-six million, nine hundred eighty-nine thousand, four hundred fifty-nine".