18549112873 has 2 divisors, whose sum is σ = 18549112874. Its totient is φ = 18549112872.

The previous prime is 18549112871. The next prime is 18549112909. The reversal of 18549112873 is 37821194581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13832582544 + 4716530329 = 117612^2 + 68677^2 .

It is a cyclic number.

It is not a de Polignac number, because 18549112873 - 2¹ = 18549112871 is a prime.

Together with 18549112871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18549112871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9274556436 + 9274556437.

It is an arithmetic number, because the mean of its divisors is an integer number (9274556437).

Almost surely, 2^18549112873 is an apocalyptic number.

It is an amenable number.

18549112873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18549112873 is an equidigital number, since it uses as much as digits as its factorization.

18549112873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The spelling of 18549112873 in words is "eighteen billion, five hundred forty-nine million, one hundred twelve thousand, eight hundred seventy-three".