65981347793 has 2 divisors, whose sum is σ = 65981347794. Its totient is φ = 65981347792.

The previous prime is 65981347769. The next prime is 65981347813. The reversal of 65981347793 is 39774318956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48010068544 + 17971279249 = 219112^2 + 134057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65981347793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65981347493) 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, 32990673896 + 32990673897.

It is an arithmetic number, because the mean of its divisors is an integer number (32990673897).

Almost surely, 2^65981347793 is an apocalyptic number.

It is an amenable number.

65981347793 is a deficient number, since it is larger than the sum of its proper divisors (1).

65981347793 is an equidigital number, since it uses as much as digits as its factorization.

65981347793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34292160, while the sum is 62.

The spelling of 65981347793 in words is "sixty-five billion, nine hundred eighty-one million, three hundred forty-seven thousand, seven hundred ninety-three".