18018499717 has 4 divisors (see below), whose sum is σ = 18220954860. Its totient is φ = 17816044576.

The previous prime is 18018499661. The next prime is 18018499721. The reversal of 18018499717 is 71799481081.

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 12707151076 + 5311348641 = 112726^2 + 72879^2 .

It is a cyclic number.

It is not a de Polignac number, because 18018499717 - 2¹¹ = 18018497669 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 (18018499417) 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, 101227438 + ... + 101227615.

It is an arithmetic number, because the mean of its divisors is an integer number (4555238715).

Almost surely, 2^18018499717 is an apocalyptic number.

It is an amenable number.

18018499717 is a deficient number, since it is larger than the sum of its proper divisors (202455143).

18018499717 is an equidigital number, since it uses as much as digits as its factorization.

18018499717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202455142.

The product of its (nonzero) digits is 1016064, while the sum is 55.

The spelling of 18018499717 in words is "eighteen billion, eighteen million, four hundred ninety-nine thousand, seven hundred seventeen".