18818757818 has 24 divisors (see below), whose sum is σ = 34768392372. Its totient is φ = 7590758784.

The previous prime is 18818757799. The next prime is 18818757863. The reversal of 18818757818 is 81875781881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18806556769 + 12201049 = 137137^2 + 3493^2 .

It is a super-2 number, since 2×18818757818² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5646221 + ... + 5649552.

Almost surely, 2^18818757818 is an apocalyptic number.

18818757818 is a deficient number, since it is larger than the sum of its proper divisors (15949634554).

18818757818 is a wasteful number, since it uses less digits than its factorization.

18818757818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11295806 (or 11295799 counting only the distinct ones).

The product of its digits is 8028160, while the sum is 62.

The spelling of 18818757818 in words is "eighteen billion, eight hundred eighteen million, seven hundred fifty-seven thousand, eight hundred eighteen".