65165217773 has 2 divisors, whose sum is σ = 65165217774. Its totient is φ = 65165217772.

The previous prime is 65165217763. The next prime is 65165217781. The reversal of 65165217773 is 37771256156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35916693289 + 29248524484 = 189517^2 + 171022^2 .

It is a cyclic number.

It is not a de Polignac number, because 65165217773 - 2⁶ = 65165217709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65165217703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32582608886 + 32582608887.

It is an arithmetic number, because the mean of its divisors is an integer number (32582608887).

Almost surely, 2^65165217773 is an apocalyptic number.

It is an amenable number.

65165217773 is a deficient number, since it is larger than the sum of its proper divisors (1).

65165217773 is an equidigital number, since it uses as much as digits as its factorization.

65165217773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1852200, while the sum is 50.

The spelling of 65165217773 in words is "sixty-five billion, one hundred sixty-five million, two hundred seventeen thousand, seven hundred seventy-three".