135968668 has 18 divisors (see below), whose sum is σ = 261543968. Its totient is φ = 61803720.

The previous prime is 135968647. The next prime is 135968681. The reversal of 135968668 is 866869531.

135968668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139980 + ... + 140947.

Almost surely, 2^135968668 is an apocalyptic number.

It is an amenable number.

135968668 is a deficient number, since it is larger than the sum of its proper divisors (125575300).

135968668 is a wasteful number, since it uses less digits than its factorization.

135968668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280953 (or 280940 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The square root of 135968668 is about 11660.5603638933. The cubic root of 135968668 is about 514.2168232383.

The spelling of 135968668 in words is "one hundred thirty-five million, nine hundred sixty-eight thousand, six hundred sixty-eight".