65365116996821 has 2 divisors, whose sum is σ = 65365116996822. Its totient is φ = 65365116996820.

The previous prime is 65365116996779. The next prime is 65365116996869. The reversal of 65365116996821 is 12869961156356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54467558685796 + 10897558311025 = 7380214^2 + 3301145^2 .

It is a cyclic number.

It is not a de Polignac number, because 65365116996821 - 2¹⁴ = 65365116980437 is a prime.

It is a super-2 number, since 2×65365116996821² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65365116995821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32682558498410 + 32682558498411.

It is an arithmetic number, because the mean of its divisors is an integer number (32682558498411).

Almost surely, 2^{65365116996821} is an apocalyptic number.

It is an amenable number.

65365116996821 is a deficient number, since it is larger than the sum of its proper divisors (1).

65365116996821 is an equidigital number, since it uses as much as digits as its factorization.

65365116996821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125971200, while the sum is 68.

The spelling of 65365116996821 in words is "sixty-five trillion, three hundred sixty-five billion, one hundred sixteen million, nine hundred ninety-six thousand, eight hundred twenty-one".