18548558213 has 4 divisors (see below), whose sum is σ = 18554660748. Its totient is φ = 18542455680.

The previous prime is 18548558209. The next prime is 18548558239. The reversal of 18548558213 is 31285584581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31285584581 = 857 ⋅36505933.

It can be written as a sum of positive squares in 2 ways, for example, as 18154059169 + 394499044 = 134737^2 + 19862^2 .

It is a cyclic number.

It is not a de Polignac number, because 18548558213 - 2² = 18548558209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18548558813) 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, 3046706 + ... + 3052787.

It is an arithmetic number, because the mean of its divisors is an integer number (4638665187).

Almost surely, 2^18548558213 is an apocalyptic number.

It is an amenable number.

18548558213 is a deficient number, since it is larger than the sum of its proper divisors (6102535).

18548558213 is an equidigital number, since it uses as much as digits as its factorization.

18548558213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6102534.

The product of its digits is 1536000, while the sum is 50.

The spelling of 18548558213 in words is "eighteen billion, five hundred forty-eight million, five hundred fifty-eight thousand, two hundred thirteen".