66117219593 has 2 divisors, whose sum is σ = 66117219594. Its totient is φ = 66117219592.

The previous prime is 66117219589. The next prime is 66117219643. The reversal of 66117219593 is 39591271166.

66117219593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (66117219643) can be obtained adding 66117219593 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62694150544 + 3423069049 = 250388^2 + 58507^2 .

It is a cyclic number.

It is not a de Polignac number, because 66117219593 - 2² = 66117219589 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 (66117219563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33058609796 + 33058609797.

It is an arithmetic number, because the mean of its divisors is an integer number (33058609797).

Almost surely, 2^66117219593 is an apocalyptic number.

It is an amenable number.

66117219593 is a deficient number, since it is larger than the sum of its proper divisors (1).

66117219593 is an equidigital number, since it uses as much as digits as its factorization.

66117219593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 50.

The spelling of 66117219593 in words is "sixty-six billion, one hundred seventeen million, two hundred nineteen thousand, five hundred ninety-three".