133681608217 has 2 divisors, whose sum is σ = 133681608218. Its totient is φ = 133681608216.

The previous prime is 133681608209. The next prime is 133681608253. The reversal of 133681608217 is 712806186331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96003304336 + 37678303881 = 309844^2 + 194109^2 .

It is a cyclic number.

It is not a de Polignac number, because 133681608217 - 2³ = 133681608209 is a prime.

It is not a weakly prime, because it can be changed into another prime (133681602217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66840804108 + 66840804109.

It is an arithmetic number, because the mean of its divisors is an integer number (66840804109).

Almost surely, 2^133681608217 is an apocalyptic number.

It is an amenable number.

133681608217 is a deficient number, since it is larger than the sum of its proper divisors (1).

133681608217 is an equidigital number, since it uses as much as digits as its factorization.

133681608217 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 46.

The spelling of 133681608217 in words is "one hundred thirty-three billion, six hundred eighty-one million, six hundred eight thousand, two hundred seventeen".