18119720056 has 16 divisors (see below), whose sum is σ = 33977028240. Its totient is φ = 9059179200.

The previous prime is 18119720029. The next prime is 18119720071. The reversal of 18119720056 is 65002791181.

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 3 ways as a sum of consecutive naturals, for example, 38580 + ... + 194236.

It is an arithmetic number, because the mean of its divisors is an integer number (2123564265).

Almost surely, 2^18119720056 is an apocalyptic number.

It is an amenable number.

18119720056 is a deficient number, since it is larger than the sum of its proper divisors (15857308184).

18119720056 is a wasteful number, since it uses less digits than its factorization.

18119720056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170214 (or 170210 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 40.

The spelling of 18119720056 in words is "eighteen billion, one hundred nineteen million, seven hundred twenty thousand, fifty-six".