18117035293 has 4 divisors (see below), whose sum is σ = 20705183200. Its totient is φ = 15528887388.

The previous prime is 18117035291. The next prime is 18117035333. The reversal of 18117035293 is 39253071181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39253071181 = 643 ⋅61046767.

It is not a de Polignac number, because 18117035293 - 2¹ = 18117035291 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 (18117035291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294073943 + ... + 1294073956.

It is an arithmetic number, because the mean of its divisors is an integer number (5176295800).

Almost surely, 2^18117035293 is an apocalyptic number.

It is an amenable number.

18117035293 is a deficient number, since it is larger than the sum of its proper divisors (2588147907).

18117035293 is an equidigital number, since it uses as much as digits as its factorization.

18117035293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588147906.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 18117035293 in words is "eighteen billion, one hundred seventeen million, thirty-five thousand, two hundred ninety-three".