66227262217 has 2 divisors, whose sum is σ = 66227262218. Its totient is φ = 66227262216.

The previous prime is 66227262191. The next prime is 66227262223. The reversal of 66227262217 is 71226272266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49113651456 + 17113610761 = 221616^2 + 130819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66227262217 is a prime.

It is not a weakly prime, because it can be changed into another prime (66227262247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33113631108 + 33113631109.

It is an arithmetic number, because the mean of its divisors is an integer number (33113631109).

Almost surely, 2^66227262217 is an apocalyptic number.

It is an amenable number.

66227262217 is a deficient number, since it is larger than the sum of its proper divisors (1).

66227262217 is an equidigital number, since it uses as much as digits as its factorization.

66227262217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 43.

The spelling of 66227262217 in words is "sixty-six billion, two hundred twenty-seven million, two hundred sixty-two thousand, two hundred seventeen".