18427003117 has 4 divisors (see below), whose sum is σ = 18430432956. Its totient is φ = 18423573280.

The previous prime is 18427003109. The next prime is 18427003121. The reversal of 18427003117 is 71130072481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1706185636 + 16720817481 = 41306^2 + 129309^2 .

It is a cyclic number.

It is not a de Polignac number, because 18427003117 - 2³ = 18427003109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18427003417) 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, 1706848 + ... + 1717609.

It is an arithmetic number, because the mean of its divisors is an integer number (4607608239).

Almost surely, 2^18427003117 is an apocalyptic number.

It is an amenable number.

18427003117 is a deficient number, since it is larger than the sum of its proper divisors (3429839).

18427003117 is an equidigital number, since it uses as much as digits as its factorization.

18427003117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3429838.

The product of its (nonzero) digits is 9408, while the sum is 34.

Adding to 18427003117 its reverse (71130072481), we get a palindrome (89557075598).

The spelling of 18427003117 in words is "eighteen billion, four hundred twenty-seven million, three thousand, one hundred seventeen".