18422138717 has 4 divisors (see below), whose sum is σ = 18920034396. Its totient is φ = 17924243040.

The previous prime is 18422138681. The next prime is 18422138729. The reversal of 18422138717 is 71783122481.

It is a happy number.

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 7891479556 + 10530659161 = 88834^2 + 102619^2 .

It is a cyclic number.

It is not a de Polignac number, because 18422138717 - 2²⁶ = 18355029853 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 (18422138767) 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, 248947784 + ... + 248947857.

It is an arithmetic number, because the mean of its divisors is an integer number (4730008599).

Almost surely, 2^18422138717 is an apocalyptic number.

It is an amenable number.

18422138717 is a deficient number, since it is larger than the sum of its proper divisors (497895679).

18422138717 is an equidigital number, since it uses as much as digits as its factorization.

18422138717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497895678.

The product of its digits is 150528, while the sum is 44.

The spelling of 18422138717 in words is "eighteen billion, four hundred twenty-two million, one hundred thirty-eight thousand, seven hundred seventeen".