65107985617 has 2 divisors, whose sum is σ = 65107985618. Its totient is φ = 65107985616.

The previous prime is 65107985597. The next prime is 65107985623. The reversal of 65107985617 is 71658970156.

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., 59017900096 + 6090085521 = 242936^2 + 78039^2 .

It is a cyclic number.

It is not a de Polignac number, because 65107985617 - 2¹¹ = 65107983569 is a prime.

It is a super-2 number, since 2×65107985617² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65107985017) 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, 32553992808 + 32553992809.

It is an arithmetic number, because the mean of its divisors is an integer number (32553992809).

Almost surely, 2^65107985617 is an apocalyptic number.

It is an amenable number.

65107985617 is a deficient number, since it is larger than the sum of its proper divisors (1).

65107985617 is an equidigital number, since it uses as much as digits as its factorization.

65107985617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 65107985617 in words is "sixty-five billion, one hundred seven million, nine hundred eighty-five thousand, six hundred seventeen".