18618493118 has 4 divisors (see below), whose sum is σ = 27927739680. Its totient is φ = 9309246558.

The previous prime is 18618493111. The next prime is 18618493141. The reversal of 18618493118 is 81139481681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18618493111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4654623278 + ... + 4654623281.

It is an arithmetic number, because the mean of its divisors is an integer number (6981934920).

Almost surely, 2^18618493118 is an apocalyptic number.

18618493118 is a deficient number, since it is larger than the sum of its proper divisors (9309246562).

18618493118 is an equidigital number, since it uses as much as digits as its factorization.

18618493118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9309246561.

The product of its digits is 331776, while the sum is 50.

The spelling of 18618493118 in words is "eighteen billion, six hundred eighteen million, four hundred ninety-three thousand, one hundred eighteen".