18049718811 has 4 divisors (see below), whose sum is σ = 24066291752. Its totient is φ = 12033145872.

The previous prime is 18049718759. The next prime is 18049718821. The reversal of 18049718811 is 11881794081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11881794081 = 3 ⋅3960598027.

It is not a de Polignac number, because 18049718811 - 2¹⁰ = 18049717787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18049718821) 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, 3008286466 + ... + 3008286471.

It is an arithmetic number, because the mean of its divisors is an integer number (6016572938).

Almost surely, 2^18049718811 is an apocalyptic number.

18049718811 is a deficient number, since it is larger than the sum of its proper divisors (6016572941).

18049718811 is an equidigital number, since it uses as much as digits as its factorization.

18049718811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6016572940.

The product of its (nonzero) digits is 129024, while the sum is 48.

The spelling of 18049718811 in words is "eighteen billion, forty-nine million, seven hundred eighteen thousand, eight hundred eleven".