18502025117 has 4 divisors (see below), whose sum is σ = 18502360956. Its totient is φ = 18501689280.

The previous prime is 18502025111. The next prime is 18502025149. The reversal of 18502025117 is 71152020581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71152020581 = 47251 ⋅1505831.

It can be written as a sum of positive squares in 2 ways, for example, as 11258483236 + 7243541881 = 106106^2 + 85109^2 .

It is a cyclic number.

It is not a de Polignac number, because 18502025117 - 2⁶ = 18502025053 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 (18502025111) 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, 63734 + ... + 202647.

It is an arithmetic number, because the mean of its divisors is an integer number (4625590239).

Almost surely, 2^18502025117 is an apocalyptic number.

It is an amenable number.

18502025117 is a deficient number, since it is larger than the sum of its proper divisors (335839).

18502025117 is an equidigital number, since it uses as much as digits as its factorization.

18502025117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335838.

The product of its (nonzero) digits is 5600, while the sum is 32.

Adding to 18502025117 its reverse (71152020581), we get a palindrome (89654045698).

The spelling of 18502025117 in words is "eighteen billion, five hundred two million, twenty-five thousand, one hundred seventeen".