17591419661 has 2 divisors, whose sum is σ = 17591419662. Its totient is φ = 17591419660.

The previous prime is 17591419621. The next prime is 17591419709. The reversal of 17591419661 is 16691419571.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16111478761 + 1479940900 = 126931^2 + 38470^2 .

It is an emirp because it is prime and its reverse (16691419571) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17591419661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17591419621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8795709830 + 8795709831.

It is an arithmetic number, because the mean of its divisors is an integer number (8795709831).

Almost surely, 2^17591419661 is an apocalyptic number.

It is an amenable number.

17591419661 is a deficient number, since it is larger than the sum of its proper divisors (1).

17591419661 is an equidigital number, since it uses as much as digits as its factorization.

17591419661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The spelling of 17591419661 in words is "seventeen billion, five hundred ninety-one million, four hundred nineteen thousand, six hundred sixty-one".