18111558103 has 4 divisors (see below), whose sum is σ = 18116377488. Its totient is φ = 18106738720.

The previous prime is 18111558089. The next prime is 18111558109. The reversal of 18111558103 is 30185511181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18111558103 is a prime.

It is a super-3 number, since 3×18111558103³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18111558109) 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, 2404051 + ... + 2411572.

It is an arithmetic number, because the mean of its divisors is an integer number (4529094372).

Almost surely, 2^18111558103 is an apocalyptic number.

18111558103 is a deficient number, since it is larger than the sum of its proper divisors (4819385).

18111558103 is an equidigital number, since it uses as much as digits as its factorization.

18111558103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4819384.

The product of its (nonzero) digits is 4800, while the sum is 34.

The spelling of 18111558103 in words is "eighteen billion, one hundred eleven million, five hundred fifty-eight thousand, one hundred three".