165651506717 has 2 divisors, whose sum is σ = 165651506718. Its totient is φ = 165651506716.

The previous prime is 165651506693. The next prime is 165651506719. The reversal of 165651506717 is 717605156561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158217790756 + 7433715961 = 397766^2 + 86219^2 .

It is a cyclic number.

It is not a de Polignac number, because 165651506717 - 2¹⁰ = 165651505693 is a prime.

It is a super-2 number, since 2×165651506717² (a number of 23 digits) contains 22 as substring.

Together with 165651506719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165651506719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82825753358 + 82825753359.

It is an arithmetic number, because the mean of its divisors is an integer number (82825753359).

Almost surely, 2^165651506717 is an apocalyptic number.

It is an amenable number.

165651506717 is a deficient number, since it is larger than the sum of its proper divisors (1).

165651506717 is an equidigital number, since it uses as much as digits as its factorization.

165651506717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1323000, while the sum is 50.

The spelling of 165651506717 in words is "one hundred sixty-five billion, six hundred fifty-one million, five hundred six thousand, seven hundred seventeen".