136640668 has 6 divisors (see below), whose sum is σ = 239121176. Its totient is φ = 68320332.

The previous prime is 136640657. The next prime is 136640681. The reversal of 136640668 is 866046631.

It is a self number, because there is not a number n which added to its sum of digits gives 136640668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17080080 + ... + 17080087.

Almost surely, 2^136640668 is an apocalyptic number.

It is an amenable number.

136640668 is a deficient number, since it is larger than the sum of its proper divisors (102480508).

136640668 is a wasteful number, since it uses less digits than its factorization.

136640668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34160171 (or 34160169 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 136640668 is about 11689.3399300388. The cubic root of 136640668 is about 515.0625719681.

The spelling of 136640668 in words is "one hundred thirty-six million, six hundred forty thousand, six hundred sixty-eight".