18978316018 has 8 divisors (see below), whose sum is σ = 28495088640. Its totient is φ = 9479953140.

The previous prime is 18978316013. The next prime is 18978316043. The reversal of 18978316018 is 81061387981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18978316013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4599858 + ... + 4603981.

It is an arithmetic number, because the mean of its divisors is an integer number (3561886080).

Almost surely, 2^18978316018 is an apocalyptic number.

18978316018 is a deficient number, since it is larger than the sum of its proper divisors (9516772622).

18978316018 is a wasteful number, since it uses less digits than its factorization.

18978316018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9204872.

The product of its (nonzero) digits is 580608, while the sum is 52.

The spelling of 18978316018 in words is "eighteen billion, nine hundred seventy-eight million, three hundred sixteen thousand, eighteen".