18549112893 has 4 divisors (see below), whose sum is σ = 24732150528. Its totient is φ = 12366075260.

The previous prime is 18549112873. The next prime is 18549112909. The reversal of 18549112893 is 39821194581.

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.

It is a cyclic number.

It is not a de Polignac number, because 18549112893 - 2²² = 18544918589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18549112853) 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, 3091518813 + ... + 3091518818.

It is an arithmetic number, because the mean of its divisors is an integer number (6183037632).

Almost surely, 2^18549112893 is an apocalyptic number.

It is an amenable number.

18549112893 is a deficient number, since it is larger than the sum of its proper divisors (6183037635).

18549112893 is an equidigital number, since it uses as much as digits as its factorization.

18549112893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183037634.

The product of its digits is 622080, while the sum is 51.

The spelling of 18549112893 in words is "eighteen billion, five hundred forty-nine million, one hundred twelve thousand, eight hundred ninety-three".