11655523717 has 4 divisors (see below), whose sum is σ = 11684021740. Its totient is φ = 11627025696.

The previous prime is 11655523687. The next prime is 11655523727. The reversal of 11655523717 is 71732555611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71732555611 = 27109 ⋅2646079.

It can be written as a sum of positive squares in 2 ways, for example, as 9990802116 + 1664721601 = 99954^2 + 40801^2 .

It is a cyclic number.

It is not a de Polignac number, because 11655523717 - 2¹⁹ = 11654999429 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 (11655523727) 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, 14248398 + ... + 14249215.

It is an arithmetic number, because the mean of its divisors is an integer number (2921005435).

Almost surely, 2^11655523717 is an apocalyptic number.

It is an amenable number.

11655523717 is a deficient number, since it is larger than the sum of its proper divisors (28498023).

11655523717 is an equidigital number, since it uses as much as digits as its factorization.

11655523717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28498022.

The product of its digits is 220500, while the sum is 43.

The spelling of 11655523717 in words is "eleven billion, six hundred fifty-five million, five hundred twenty-three thousand, seven hundred seventeen".