18696782717 has 4 divisors (see below), whose sum is σ = 18701989980. Its totient is φ = 18691575456.

The previous prime is 18696782711. The next prime is 18696782719. The reversal of 18696782717 is 71728769681.

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 12460363876 + 6236418841 = 111626^2 + 78971^2 .

It is a cyclic number.

It is not a de Polignac number, because 18696782717 - 2⁶ = 18696782653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18696782717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18696782711) 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, 2598242 + ... + 2605427.

It is an arithmetic number, because the mean of its divisors is an integer number (4675497495).

Almost surely, 2^18696782717 is an apocalyptic number.

It is an amenable number.

18696782717 is a deficient number, since it is larger than the sum of its proper divisors (5207263).

18696782717 is an equidigital number, since it uses as much as digits as its factorization.

18696782717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5207262.

The product of its digits is 14224896, while the sum is 62.

The spelling of 18696782717 in words is "eighteen billion, six hundred ninety-six million, seven hundred eighty-two thousand, seven hundred seventeen".