18917944318 has 32 divisors (see below), whose sum is σ = 36979879104. Its totient is φ = 7043784192.

The previous prime is 18917944307. The next prime is 18917944327. The reversal of 18917944318 is 81344971981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3054105 + ... + 3060292.

It is an arithmetic number, because the mean of its divisors is an integer number (1155621222).

Almost surely, 2^18917944318 is an apocalyptic number.

18917944318 is a deficient number, since it is larger than the sum of its proper divisors (18061934786).

18917944318 is a wasteful number, since it uses less digits than its factorization.

18917944318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6114436.

The product of its digits is 1741824, while the sum is 55.

The spelling of 18917944318 in words is "eighteen billion, nine hundred seventeen million, nine hundred forty-four thousand, three hundred eighteen".