18944396297 has 4 divisors (see below), whose sum is σ = 18944684160. Its totient is φ = 18944108436.

The previous prime is 18944396287. The next prime is 18944396299. The reversal of 18944396297 is 79269344981.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18944396297 - 2⁴ = 18944396281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18944396299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8828 + ... + 194850.

It is an arithmetic number, because the mean of its divisors is an integer number (4736171040).

Almost surely, 2^18944396297 is an apocalyptic number.

It is an amenable number.

18944396297 is a deficient number, since it is larger than the sum of its proper divisors (287863).

18944396297 is a wasteful number, since it uses less digits than its factorization.

18944396297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287862.

The product of its digits is 23514624, while the sum is 62.

The spelling of 18944396297 in words is "eighteen billion, nine hundred forty-four million, three hundred ninety-six thousand, two hundred ninety-seven".