18500111120 has 20 divisors (see below), whose sum is σ = 43012758540. Its totient is φ = 7400044416.

The previous prime is 18500111107. The next prime is 18500111131. The reversal of 18500111120 is 2111100581.

It can be written as a sum of positive squares in 2 ways, for example, as 9778045456 + 8722065664 = 98884^2 + 93392^2 .

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

It is a super-2 number, since 2×18500111120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 18500111092 and 18500111101.

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, 115625615 + ... + 115625774.

It is an arithmetic number, because the mean of its divisors is an integer number (2150637927).

Almost surely, 2^18500111120 is an apocalyptic number.

18500111120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18500111120 is an abundant number, since it is smaller than the sum of its proper divisors (24512647420).

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

18500111120 is a wasteful number, since it uses less digits than its factorization.

18500111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231251402 (or 231251396 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 20.

The spelling of 18500111120 in words is "eighteen billion, five hundred million, one hundred eleven thousand, one hundred twenty".