66227472217 has 2 divisors, whose sum is σ = 66227472218. Its totient is φ = 66227472216.

The previous prime is 66227472209. The next prime is 66227472277. The reversal of 66227472217 is 71227472266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55556375616 + 10671096601 = 235704^2 + 103301^2 .

It is a cyclic number.

It is not a de Polignac number, because 66227472217 - 2³ = 66227472209 is a prime.

It is not a weakly prime, because it can be changed into another prime (66227472277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33113736108 + 33113736109.

It is an arithmetic number, because the mean of its divisors is an integer number (33113736109).

Almost surely, 2^66227472217 is an apocalyptic number.

It is an amenable number.

66227472217 is a deficient number, since it is larger than the sum of its proper divisors (1).

66227472217 is an equidigital number, since it uses as much as digits as its factorization.

66227472217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 46.

The spelling of 66227472217 in words is "sixty-six billion, two hundred twenty-seven million, four hundred seventy-two thousand, two hundred seventeen".