18149944720 has 20 divisors (see below), whose sum is σ = 42198621660. Its totient is φ = 7259977856.

The previous prime is 18149944661. The next prime is 18149944741. The reversal of 18149944720 is 2744994181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3399356416 + 14750588304 = 58304^2 + 121452^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113437075 + ... + 113437234.

It is an arithmetic number, because the mean of its divisors is an integer number (2109931083).

Almost surely, 2^18149944720 is an apocalyptic number.

18149944720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18149944720 is an abundant number, since it is smaller than the sum of its proper divisors (24048676940).

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

18149944720 is a wasteful number, since it uses less digits than its factorization.

18149944720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226874322 (or 226874316 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 18149944720 in words is "eighteen billion, one hundred forty-nine million, nine hundred forty-four thousand, seven hundred twenty".