17111345561 has 2 divisors, whose sum is σ = 17111345562. Its totient is φ = 17111345560.

The previous prime is 17111345509. The next prime is 17111345591. The reversal of 17111345561 is 16554311171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10209889936 + 6901455625 = 101044^2 + 83075^2 .

It is a cyclic number.

It is not a de Polignac number, because 17111345561 - 2¹⁴ = 17111329177 is a prime.

It is not a weakly prime, because it can be changed into another prime (17111345591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8555672780 + 8555672781.

It is an arithmetic number, because the mean of its divisors is an integer number (8555672781).

Almost surely, 2^17111345561 is an apocalyptic number.

It is an amenable number.

17111345561 is a deficient number, since it is larger than the sum of its proper divisors (1).

17111345561 is an equidigital number, since it uses as much as digits as its factorization.

17111345561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 35.

The spelling of 17111345561 in words is "seventeen billion, one hundred eleven million, three hundred forty-five thousand, five hundred sixty-one".