18085371071 has 4 divisors (see below), whose sum is σ = 18303267192. Its totient is φ = 17867474952.

The previous prime is 18085371061. The next prime is 18085371091. The reversal of 18085371071 is 17017358081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17017358081 = 78157 ⋅217733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18085371071 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 (18085371011) 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, 108947936 + ... + 108948101.

It is an arithmetic number, because the mean of its divisors is an integer number (4575816798).

Almost surely, 2^18085371071 is an apocalyptic number.

18085371071 is a deficient number, since it is larger than the sum of its proper divisors (217896121).

18085371071 is an equidigital number, since it uses as much as digits as its factorization.

18085371071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217896120.

The product of its (nonzero) digits is 47040, while the sum is 41.

The spelling of 18085371071 in words is "eighteen billion, eighty-five million, three hundred seventy-one thousand, seventy-one".