66717644010197 has 2 divisors, whose sum is σ = 66717644010198. Its totient is φ = 66717644010196.

The previous prime is 66717644010181. The next prime is 66717644010203. The reversal of 66717644010197 is 79101044671766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40612503366436 + 26105140643761 = 6372794^2 + 5109319^2 .

It is a cyclic number.

It is not a de Polignac number, because 66717644010197 - 2⁴ = 66717644010181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66717644010167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33358822005098 + 33358822005099.

It is an arithmetic number, because the mean of its divisors is an integer number (33358822005099).

Almost surely, 2^{66717644010197} is an apocalyptic number.

It is an amenable number.

66717644010197 is a deficient number, since it is larger than the sum of its proper divisors (1).

66717644010197 is an equidigital number, since it uses as much as digits as its factorization.

66717644010197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10668672, while the sum is 59.

The spelling of 66717644010197 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-four million, ten thousand, one hundred ninety-seven".