17205421639613 has 2 divisors, whose sum is σ = 17205421639614. Its totient is φ = 17205421639612.

The previous prime is 17205421639607. The next prime is 17205421639639. The reversal of 17205421639613 is 31693612450271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11879582342329 + 5325839297284 = 3446677^2 + 2307778^2 .

It is a cyclic number.

It is not a de Polignac number, because 17205421639613 - 2⁴ = 17205421639597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17205421630613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8602710819806 + 8602710819807.

It is an arithmetic number, because the mean of its divisors is an integer number (8602710819807).

Almost surely, 2^{17205421639613} is an apocalyptic number.

It is an amenable number.

17205421639613 is a deficient number, since it is larger than the sum of its proper divisors (1).

17205421639613 is an equidigital number, since it uses as much as digits as its factorization.

17205421639613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 17205421639613 in words is "seventeen trillion, two hundred five billion, four hundred twenty-one million, six hundred thirty-nine thousand, six hundred thirteen".