65844521213 has 2 divisors, whose sum is σ = 65844521214. Its totient is φ = 65844521212.

The previous prime is 65844521189. The next prime is 65844521231. The reversal of 65844521213 is 31212544856.

Together with next prime (65844521231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64129484644 + 1715036569 = 253238^2 + 41413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65844521213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65844521243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32922260606 + 32922260607.

It is an arithmetic number, because the mean of its divisors is an integer number (32922260607).

Almost surely, 2^65844521213 is an apocalyptic number.

It is an amenable number.

65844521213 is a deficient number, since it is larger than the sum of its proper divisors (1).

65844521213 is an equidigital number, since it uses as much as digits as its factorization.

65844521213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 41.

The spelling of 65844521213 in words is "sixty-five billion, eight hundred forty-four million, five hundred twenty-one thousand, two hundred thirteen".