18639822799 has 4 divisors (see below), whose sum is σ = 20073655336. Its totient is φ = 17205990264.

The previous prime is 18639822797. The next prime is 18639822811. The reversal of 18639822799 is 99722893681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99722893681 = 191 ⋅522109391.

It is a cyclic number.

It is not a de Polignac number, because 18639822799 - 2¹ = 18639822797 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 18639822799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639822797) 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, 716916249 + ... + 716916274.

It is an arithmetic number, because the mean of its divisors is an integer number (5018413834).

Almost surely, 2^18639822799 is an apocalyptic number.

18639822799 is a deficient number, since it is larger than the sum of its proper divisors (1433832537).

18639822799 is a wasteful number, since it uses less digits than its factorization.

18639822799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433832536.

The product of its digits is 23514624, while the sum is 64.

The spelling of 18639822799 in words is "eighteen billion, six hundred thirty-nine million, eight hundred twenty-two thousand, seven hundred ninety-nine".