18408816178 has 16 divisors (see below), whose sum is σ = 29416756320. Its totient is φ = 8614904256.

The previous prime is 18408816169. The next prime is 18408816191. The reversal of 18408816178 is 87161880481.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2915175 + ... + 2921482.

It is an arithmetic number, because the mean of its divisors is an integer number (1838547270).

Almost surely, 2^18408816178 is an apocalyptic number.

18408816178 is a deficient number, since it is larger than the sum of its proper divisors (11007940142).

18408816178 is a wasteful number, since it uses less digits than its factorization.

18408816178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5836761.

The product of its (nonzero) digits is 688128, while the sum is 52.

The spelling of 18408816178 in words is "eighteen billion, four hundred eight million, eight hundred sixteen thousand, one hundred seventy-eight".