65806636911493 has 2 divisors, whose sum is σ = 65806636911494. Its totient is φ = 65806636911492.

The previous prime is 65806636911413. The next prime is 65806636911527. The reversal of 65806636911493 is 39411963660856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65622425988289 + 184210923204 = 8100767^2 + 429198^2 .

It is a cyclic number.

It is not a de Polignac number, because 65806636911493 - 2⁴⁵ = 30622264822661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65806636911403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32903318455746 + 32903318455747.

It is an arithmetic number, because the mean of its divisors is an integer number (32903318455747).

Almost surely, 2^{65806636911493} is an apocalyptic number.

It is an amenable number.

65806636911493 is a deficient number, since it is larger than the sum of its proper divisors (1).

65806636911493 is an equidigital number, since it uses as much as digits as its factorization.

65806636911493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151165440, while the sum is 67.

The spelling of 65806636911493 in words is "sixty-five trillion, eight hundred six billion, six hundred thirty-six million, nine hundred eleven thousand, four hundred ninety-three".