18666419243 has 4 divisors (see below), whose sum is σ = 18695450088. Its totient is φ = 18637388400.

The previous prime is 18666419231. The next prime is 18666419251. The reversal of 18666419243 is 34291466681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34291466681 = 6047 ⋅5670823.

It is a cyclic number.

It is not a de Polignac number, because 18666419243 - 2⁶ = 18666419179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18666419191 and 18666419200.

It is not an unprimeable number, because it can be changed into a prime (18666419293) 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 in 3 ways as a sum of consecutive naturals, for example, 14514458 + ... + 14515743.

It is an arithmetic number, because the mean of its divisors is an integer number (4673862522).

Almost surely, 2^18666419243 is an apocalyptic number.

18666419243 is a deficient number, since it is larger than the sum of its proper divisors (29030845).

18666419243 is an equidigital number, since it uses as much as digits as its factorization.

18666419243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29030844.

The product of its digits is 1492992, while the sum is 50.

The spelling of 18666419243 in words is "eighteen billion, six hundred sixty-six million, four hundred nineteen thousand, two hundred forty-three".