17171065657661 has 2 divisors, whose sum is σ = 17171065657662. Its totient is φ = 17171065657660.

The previous prime is 17171065657643. The next prime is 17171065657693. The reversal of 17171065657661 is 16675656017171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17170498312900 + 567344761 = 4143730^2 + 23819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17171065657661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17171065657661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17171065657961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8585532828830 + 8585532828831.

It is an arithmetic number, because the mean of its divisors is an integer number (8585532828831).

Almost surely, 2^{17171065657661} is an apocalyptic number.

It is an amenable number.

17171065657661 is a deficient number, since it is larger than the sum of its proper divisors (1).

17171065657661 is an equidigital number, since it uses as much as digits as its factorization.

17171065657661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11113200, while the sum is 59.

The spelling of 17171065657661 in words is "seventeen trillion, one hundred seventy-one billion, sixty-five million, six hundred fifty-seven thousand, six hundred sixty-one".