136665665 has 8 divisors (see below), whose sum is σ = 164205888. Its totient is φ = 109194480.

The previous prime is 136665637. The next prime is 136665667. The reversal of 136665665 is 566566631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 136665665 - 2¹⁰ = 136664641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136665667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12797 + ... + 20906.

It is an arithmetic number, because the mean of its divisors is an integer number (20525736).

Almost surely, 2^136665665 is an apocalyptic number.

It is an amenable number.

136665665 is a deficient number, since it is larger than the sum of its proper divisors (27540223).

136665665 is an equidigital number, since it uses as much as digits as its factorization.

136665665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34519.

The product of its digits is 583200, while the sum is 44.

The square root of 136665665 is about 11690.4091031922. The cubic root of 136665665 is about 515.0939785136.

The spelling of 136665665 in words is "one hundred thirty-six million, six hundred sixty-five thousand, six hundred sixty-five".