66808822240817 has 2 divisors, whose sum is σ = 66808822240818. Its totient is φ = 66808822240816.

The previous prime is 66808822240813. The next prime is 66808822240879. The reversal of 66808822240817 is 71804222880866.

It is an a-pointer prime, because the next prime (66808822240879) can be obtained adding 66808822240817 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45570586858801 + 21238235382016 = 6750599^2 + 4608496^2 .

It is a cyclic number.

It is not a de Polignac number, because 66808822240817 - 2² = 66808822240813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66808822240817.

It is not a weakly prime, because it can be changed into another prime (66808822240813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33404411120408 + 33404411120409.

It is an arithmetic number, because the mean of its divisors is an integer number (33404411120409).

Almost surely, 2^{66808822240817} is an apocalyptic number.

It is an amenable number.

66808822240817 is a deficient number, since it is larger than the sum of its proper divisors (1).

66808822240817 is an equidigital number, since it uses as much as digits as its factorization.

66808822240817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33030144, while the sum is 62.

The spelling of 66808822240817 in words is "sixty-six trillion, eight hundred eight billion, eight hundred twenty-two million, two hundred forty thousand, eight hundred seventeen".