133681608218 has 4 divisors (see below), whose sum is σ = 200522412330. Its totient is φ = 66840804108.

The previous prime is 133681608217. The next prime is 133681608253. The reversal of 133681608218 is 812806186331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 87416609569 + 46264998649 = 295663^2 + 215093^2 .

It is not an unprimeable number, because it can be changed into a prime (133681608217) 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, 33420402053 + ... + 33420402056.

Almost surely, 2^133681608218 is an apocalyptic number.

133681608218 is a deficient number, since it is larger than the sum of its proper divisors (66840804112).

133681608218 is an equidigital number, since it uses as much as digits as its factorization.

133681608218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66840804111.

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 133681608218 in words is "one hundred thirty-three billion, six hundred eighty-one million, six hundred eight thousand, two hundred eighteen".