161705710213 has 2 divisors, whose sum is σ = 161705710214. Its totient is φ = 161705710212.

The previous prime is 161705710109. The next prime is 161705710267. The reversal of 161705710213 is 312017507161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159629814369 + 2075895844 = 399537^2 + 45562^2 .

It is a cyclic number.

It is not a de Polignac number, because 161705710213 - 2³³ = 153115775621 is a prime.

It is a super-2 number, since 2×161705710213² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161705710613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80852855106 + 80852855107.

It is an arithmetic number, because the mean of its divisors is an integer number (80852855107).

Almost surely, 2^161705710213 is an apocalyptic number.

It is an amenable number.

161705710213 is a deficient number, since it is larger than the sum of its proper divisors (1).

161705710213 is an equidigital number, since it uses as much as digits as its factorization.

161705710213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 34.

The spelling of 161705710213 in words is "one hundred sixty-one billion, seven hundred five million, seven hundred ten thousand, two hundred thirteen".