18978123531708 has 144 divisors (see below), whose sum is σ = 55425980937600. Its totient is φ = 5414839839360.

The previous prime is 18978123531683. The next prime is 18978123531779. The reversal of 18978123531708 is 80713532187981.

18978123531708 is a `hidden beast` number, since 1 + 8 + 9 + 7 + 8 + 1 + 23 + 531 + 70 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6510843 + ... + 8963666.

It is an arithmetic number, because the mean of its divisors is an integer number (384902645400).

Almost surely, 2^{18978123531708} is an apocalyptic number.

18978123531708 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18978123531708 is an abundant number, since it is smaller than the sum of its proper divisors (36447857405892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18978123531708 is a wasteful number, since it uses less digits than its factorization.

18978123531708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15474712 (or 15474707 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 63.

The spelling of 18978123531708 in words is "eighteen trillion, nine hundred seventy-eight billion, one hundred twenty-three million, five hundred thirty-one thousand, seven hundred eight".