65768305381 has 2 divisors, whose sum is σ = 65768305382. Its totient is φ = 65768305380.

The previous prime is 65768305357. The next prime is 65768305387. The reversal of 65768305381 is 18350386756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64856808900 + 911496481 = 254670^2 + 30191^2 .

It is a cyclic number.

It is not a de Polignac number, because 65768305381 - 2¹¹ = 65768303333 is a prime.

It is a super-2 number, since 2×65768305381² (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 (65768305387) 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, 32884152690 + 32884152691.

It is an arithmetic number, because the mean of its divisors is an integer number (32884152691).

Almost surely, 2^65768305381 is an apocalyptic number.

It is an amenable number.

65768305381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65768305381 is an equidigital number, since it uses as much as digits as its factorization.

65768305381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 65768305381 in words is "sixty-five billion, seven hundred sixty-eight million, three hundred five thousand, three hundred eighty-one".