66595459850197 has 2 divisors, whose sum is σ = 66595459850198. Its totient is φ = 66595459850196.

The previous prime is 66595459850191. The next prime is 66595459850267. The reversal of 66595459850197 is 79105895459566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56904105597361 + 9691354252836 = 7543481^2 + 3113094^2 .

It is a cyclic number.

It is not a de Polignac number, because 66595459850197 - 2¹¹ = 66595459848149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66595459850191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33297729925098 + 33297729925099.

It is an arithmetic number, because the mean of its divisors is an integer number (33297729925099).

Almost surely, 2^{66595459850197} is an apocalyptic number.

It is an amenable number.

66595459850197 is a deficient number, since it is larger than the sum of its proper divisors (1).

66595459850197 is an equidigital number, since it uses as much as digits as its factorization.

66595459850197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160000, while the sum is 79.

The spelling of 66595459850197 in words is "sixty-six trillion, five hundred ninety-five billion, four hundred fifty-nine million, eight hundred fifty thousand, one hundred ninety-seven".