18518478944 has 24 divisors (see below), whose sum is σ = 41666578128. Its totient is φ = 7936490880.

The previous prime is 18518478941. The next prime is 18518478949. The reversal of 18518478944 is 44987481581.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518478941) 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, 41335667 + ... + 41336114.

It is an arithmetic number, because the mean of its divisors is an integer number (1736107422).

Almost surely, 2^18518478944 is an apocalyptic number.

18518478944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18518478944 is an abundant number, since it is smaller than the sum of its proper divisors (23148099184).

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

18518478944 is an equidigital number, since it uses as much as digits as its factorization.

18518478944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82671798 (or 82671790 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 59.

The spelling of 18518478944 in words is "eighteen billion, five hundred eighteen million, four hundred seventy-eight thousand, nine hundred forty-four".