111717927817 has 2 divisors, whose sum is σ = 111717927818. Its totient is φ = 111717927816.

The previous prime is 111717927791. The next prime is 111717927887. The reversal of 111717927817 is 718729717111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109077612361 + 2640315456 = 330269^2 + 51384^2 .

It is a cyclic number.

It is not a de Polignac number, because 111717927817 - 2¹⁵ = 111717895049 is a prime.

It is not a weakly prime, because it can be changed into another prime (111717927887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55858963908 + 55858963909.

It is an arithmetic number, because the mean of its divisors is an integer number (55858963909).

Almost surely, 2^111717927817 is an apocalyptic number.

It is an amenable number.

111717927817 is a deficient number, since it is larger than the sum of its proper divisors (1).

111717927817 is an equidigital number, since it uses as much as digits as its factorization.

111717927817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345744, while the sum is 52.

The spelling of 111717927817 in words is "one hundred eleven billion, seven hundred seventeen million, nine hundred twenty-seven thousand, eight hundred seventeen".