65840973193 has 2 divisors, whose sum is σ = 65840973194. Its totient is φ = 65840973192.

The previous prime is 65840973181. The next prime is 65840973199. The reversal of 65840973193 is 39137904856.

65840973193 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42270126409 + 23570846784 = 205597^2 + 153528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65840973193 is a prime.

It is not a weakly prime, because it can be changed into another prime (65840973199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32920486596 + 32920486597.

It is an arithmetic number, because the mean of its divisors is an integer number (32920486597).

Almost surely, 2^65840973193 is an apocalyptic number.

It is an amenable number.

65840973193 is a deficient number, since it is larger than the sum of its proper divisors (1).

65840973193 is an equidigital number, since it uses as much as digits as its factorization.

65840973193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 65840973193 in words is "sixty-five billion, eight hundred forty million, nine hundred seventy-three thousand, one hundred ninety-three".