18808147686868 has 12 divisors (see below), whose sum is σ = 32922872521812. Its totient is φ = 9401612680640.

The previous prime is 18808147686847. The next prime is 18808147686871. The reversal of 18808147686868 is 86868674180881.

It can be written as a sum of positive squares in 2 ways, for example, as 10985061754384 + 7823085932484 = 3314372^2 + 2796978^2 .

It is a super-2 number, since 2×18808147686868² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615273505 + ... + 615304072.

It is an arithmetic number, because the mean of its divisors is an integer number (2743572710151).

Almost surely, 2^{18808147686868} is an apocalyptic number.

It is an amenable number.

18808147686868 is a deficient number, since it is larger than the sum of its proper divisors (14114724834944).

18808147686868 is a wasteful number, since it uses less digits than its factorization.

18808147686868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230581402 (or 1230581400 counting only the distinct ones).

The product of its (nonzero) digits is 1585446912, while the sum is 79.

The spelling of 18808147686868 in words is "eighteen trillion, eight hundred eight billion, one hundred forty-seven million, six hundred eighty-six thousand, eight hundred sixty-eight".