65810609911 has 2 divisors, whose sum is σ = 65810609912. Its totient is φ = 65810609910.

The previous prime is 65810609881. The next prime is 65810609923. The reversal of 65810609911 is 11990601856.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65810609911 is a prime.

It is a super-2 number, since 2×65810609911² (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 (65810609951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32905304955 + 32905304956.

It is an arithmetic number, because the mean of its divisors is an integer number (32905304956).

Almost surely, 2^65810609911 is an apocalyptic number.

65810609911 is a deficient number, since it is larger than the sum of its proper divisors (1).

65810609911 is an equidigital number, since it uses as much as digits as its factorization.

65810609911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 46.

The spelling of 65810609911 in words is "sixty-five billion, eight hundred ten million, six hundred nine thousand, nine hundred eleven".