65165256173 has 2 divisors, whose sum is σ = 65165256174. Its totient is φ = 65165256172.

The previous prime is 65165256119. The next prime is 65165256181. The reversal of 65165256173 is 37165256156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36013791529 + 29151464644 = 189773^2 + 170738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65165256173 is a prime.

It is a super-2 number, since 2×65165256173² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65165256193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32582628086 + 32582628087.

It is an arithmetic number, because the mean of its divisors is an integer number (32582628087).

Almost surely, 2^65165256173 is an apocalyptic number.

It is an amenable number.

65165256173 is a deficient number, since it is larger than the sum of its proper divisors (1).

65165256173 is an equidigital number, since it uses as much as digits as its factorization.

65165256173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134000, while the sum is 47.

The spelling of 65165256173 in words is "sixty-five billion, one hundred sixty-five million, two hundred fifty-six thousand, one hundred seventy-three".