18126112387 has 4 divisors (see below), whose sum is σ = 18126387720. Its totient is φ = 18125837056.

The previous prime is 18126112349. The next prime is 18126112427. The reversal of 18126112387 is 78321162181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78321162181 = 53 ⋅1477757777.

It is a cyclic number.

It is not a de Polignac number, because 18126112387 - 2²³ = 18117723779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18126112087) 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, 25728 + ... + 192130.

It is an arithmetic number, because the mean of its divisors is an integer number (4531596930).

Almost surely, 2^18126112387 is an apocalyptic number.

18126112387 is a deficient number, since it is larger than the sum of its proper divisors (275333).

18126112387 is a wasteful number, since it uses less digits than its factorization.

18126112387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275332.

The product of its digits is 32256, while the sum is 40.

The spelling of 18126112387 in words is "eighteen billion, one hundred twenty-six million, one hundred twelve thousand, three hundred eighty-seven".