18978979282218 has 24 divisors (see below), whose sum is σ = 41393447093856. Its totient is φ = 6284430225000.

The previous prime is 18978979282217. The next prime is 18978979282243. The reversal of 18978979282218 is 81228297987981.

18978979282218 is a `hidden beast` number, since 189 + 7 + 89 + 79 + 2 + 82 + 218 = 666.

It is not an unprimeable number, because it can be changed into a prime (18978979282217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3491347408 + ... + 3491352843.

It is an arithmetic number, because the mean of its divisors is an integer number (1724726962244).

Almost surely, 2^{18978979282218} is an apocalyptic number.

18978979282218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18978979282218 is an abundant number, since it is smaller than the sum of its proper divisors (22414467811638).

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

18978979282218 is a wasteful number, since it uses less digits than its factorization.

18978979282218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6982700410 (or 6982700407 counting only the distinct ones).

The product of its digits is 1170505728, while the sum is 81.

The spelling of 18978979282218 in words is "eighteen trillion, nine hundred seventy-eight billion, nine hundred seventy-nine million, two hundred eighty-two thousand, two hundred eighteen".