11717859717 has 6 divisors (see below), whose sum is σ = 16925797382. Its totient is φ = 7811906472.

The previous prime is 11717859701. The next prime is 11717859719. The reversal of 11717859717 is 71795871711.

It can be written as a sum of positive squares in only one way, i.e., 10464062436 + 1253797281 = 102294^2 + 35409^2 .

It is not a de Polignac number, because 11717859717 - 2⁴ = 11717859701 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 (11717859719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 650992198 + ... + 650992215.

Almost surely, 2^11717859717 is an apocalyptic number.

It is an amenable number.

11717859717 is a deficient number, since it is larger than the sum of its proper divisors (5207937665).

11717859717 is a wasteful number, since it uses less digits than its factorization.

11717859717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301984419 (or 1301984416 counting only the distinct ones).

The product of its digits is 864360, while the sum is 54.

The spelling of 11717859717 in words is "eleven billion, seven hundred seventeen million, eight hundred fifty-nine thousand, seven hundred seventeen".