18448833649 has 4 divisors (see below), whose sum is σ = 18877876336. Its totient is φ = 18019790964.

The previous prime is 18448833643. The next prime is 18448833703. The reversal of 18448833649 is 94633884481.

It is a happy number.

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: 94633884481 = 31 ⋅3052705951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18448833649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18448833593 and 18448833602.

It is not an unprimeable number, because it can be changed into a prime (18448833643) 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, 214521279 + ... + 214521364.

It is an arithmetic number, because the mean of its divisors is an integer number (4719469084).

Almost surely, 2^18448833649 is an apocalyptic number.

It is an amenable number.

18448833649 is a deficient number, since it is larger than the sum of its proper divisors (429042687).

18448833649 is an equidigital number, since it uses as much as digits as its factorization.

18448833649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429042686.

The product of its digits is 15925248, while the sum is 58.

The spelling of 18448833649 in words is "eighteen billion, four hundred forty-eight million, eight hundred thirty-three thousand, six hundred forty-nine".