133681602217 has 2 divisors, whose sum is σ = 133681602218. Its totient is φ = 133681602216.

The previous prime is 133681602211. The next prime is 133681602259. The reversal of 133681602217 is 712206186331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133589519001 + 92083216 = 365499^2 + 9596^2 .

It is an emirp because it is prime and its reverse (712206186331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133681602217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133681602217.

It is not a weakly prime, because it can be changed into another prime (133681602211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66840801108 + 66840801109.

It is an arithmetic number, because the mean of its divisors is an integer number (66840801109).

Almost surely, 2^133681602217 is an apocalyptic number.

It is an amenable number.

133681602217 is a deficient number, since it is larger than the sum of its proper divisors (1).

133681602217 is an equidigital number, since it uses as much as digits as its factorization.

133681602217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

Adding to 133681602217 its reverse (712206186331), we get a palindrome (845887788548).

The spelling of 133681602217 in words is "one hundred thirty-three billion, six hundred eighty-one million, six hundred two thousand, two hundred seventeen".