6661134420217 has 2 divisors, whose sum is σ = 6661134420218. Its totient is φ = 6661134420216.

The previous prime is 6661134420209. The next prime is 6661134420233. The reversal of 6661134420217 is 7120244311666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4966943224896 + 1694191195321 = 2228664^2 + 1301611^2 .

It is a cyclic number.

It is not a de Polignac number, because 6661134420217 - 2³ = 6661134420209 is a prime.

It is not a weakly prime, because it can be changed into another prime (6661134420277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330567210108 + 3330567210109.

It is an arithmetic number, because the mean of its divisors is an integer number (3330567210109).

Almost surely, 2^{6661134420217} is an apocalyptic number.

It is an amenable number.

6661134420217 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661134420217 is an equidigital number, since it uses as much as digits as its factorization.

6661134420217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 6661134420217 in words is "six trillion, six hundred sixty-one billion, one hundred thirty-four million, four hundred twenty thousand, two hundred seventeen".