18820217833 has 4 divisors (see below), whose sum is σ = 18874455120. Its totient is φ = 18765980548.

The previous prime is 18820217809. The next prime is 18820217881. The reversal of 18820217833 is 33871202881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33871202881 = 61 ⋅555265621.

It is a cyclic number.

It is not a de Polignac number, because 18820217833 - 2³³ = 10230283241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18820217833.

It is not an unprimeable number, because it can be changed into a prime (18820217233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27118123 + ... + 27118816.

It is an arithmetic number, because the mean of its divisors is an integer number (4718613780).

Almost surely, 2^18820217833 is an apocalyptic number.

It is an amenable number.

18820217833 is a deficient number, since it is larger than the sum of its proper divisors (54237287).

18820217833 is an equidigital number, since it uses as much as digits as its factorization.

18820217833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54237286.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 18820217833 in words is "eighteen billion, eight hundred twenty million, two hundred seventeen thousand, eight hundred thirty-three".