11716721576617 has 2 divisors, whose sum is σ = 11716721576618. Its totient is φ = 11716721576616.

The previous prime is 11716721576587. The next prime is 11716721576629. The reversal of 11716721576617 is 71667512761711.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6393231338256 + 5323490238361 = 2528484^2 + 2307269^2 .

It is a cyclic number.

It is not a de Polignac number, because 11716721576617 - 2²³ = 11716713188009 is a prime.

It is not a weakly prime, because it can be changed into another prime (11716721576317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5858360788308 + 5858360788309.

It is an arithmetic number, because the mean of its divisors is an integer number (5858360788309).

Almost surely, 2^{11716721576617} is an apocalyptic number.

It is an amenable number.

11716721576617 is a deficient number, since it is larger than the sum of its proper divisors (1).

11716721576617 is an equidigital number, since it uses as much as digits as its factorization.

11716721576617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5186160, while the sum is 58.

The spelling of 11716721576617 in words is "eleven trillion, seven hundred sixteen billion, seven hundred twenty-one million, five hundred seventy-six thousand, six hundred seventeen".