18778181318 has 64 divisors (see below), whose sum is σ = 33043635072. Its totient is φ = 7933178880.

The previous prime is 18778181311. The next prime is 18778181369. The reversal of 18778181318 is 81318187781.

It is a happy number.

It is a super-2 number, since 2×18778181318² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18778181318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18778181311) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 1342730 + ... + 1356642.

It is an arithmetic number, because the mean of its divisors is an integer number (516306798).

Almost surely, 2^18778181318 is an apocalyptic number.

18778181318 is a deficient number, since it is larger than the sum of its proper divisors (14265453754).

18778181318 is a wasteful number, since it uses less digits than its factorization.

18778181318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14049.

The product of its digits is 602112, while the sum is 53.

The spelling of 18778181318 in words is "eighteen billion, seven hundred seventy-eight million, one hundred eighty-one thousand, three hundred eighteen".