18057776818 has 4 divisors (see below), whose sum is σ = 27086665230. Its totient is φ = 9028888408.

The previous prime is 18057776809. The next prime is 18057776837. The reversal of 18057776818 is 81867775081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81867775081 = 271 ⋅302095111.

It can be written as a sum of positive squares in only one way, i.e., 9991401849 + 8066374969 = 99957^2 + 89813^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4514444203 + ... + 4514444206.

Almost surely, 2^18057776818 is an apocalyptic number.

18057776818 is a deficient number, since it is larger than the sum of its proper divisors (9028888412).

18057776818 is an equidigital number, since it uses as much as digits as its factorization.

18057776818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9028888411.

The product of its (nonzero) digits is 5268480, while the sum is 58.

The spelling of 18057776818 in words is "eighteen billion, fifty-seven million, seven hundred seventy-six thousand, eight hundred eighteen".