18448242779 has 4 divisors (see below), whose sum is σ = 18760924920. Its totient is φ = 18135560640.

The previous prime is 18448242773. The next prime is 18448242797. The reversal of 18448242779 is 97724284481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97724284481 = 312289 ⋅312929.

It is a cyclic number.

It is not a de Polignac number, because 18448242779 - 2²⁰ = 18447194203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18448242773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156340982 + ... + 156341099.

It is an arithmetic number, because the mean of its divisors is an integer number (4690231230).

Almost surely, 2^18448242779 is an apocalyptic number.

18448242779 is a deficient number, since it is larger than the sum of its proper divisors (312682141).

18448242779 is an equidigital number, since it uses as much as digits as its factorization.

18448242779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312682140.

The product of its digits is 7225344, while the sum is 56.

The spelling of 18448242779 in words is "eighteen billion, four hundred forty-eight million, two hundred forty-two thousand, seven hundred seventy-nine".