136665436243 has 64 divisors (see below), whose sum is σ = 175076858880. Its totient is φ = 104061542400.

The previous prime is 136665436241. The next prime is 136665436307. The reversal of 136665436243 is 342634566631.

It is not a de Polignac number, because 136665436243 - 2¹ = 136665436241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136665436241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16742083 + ... + 16750243.

It is an arithmetic number, because the mean of its divisors is an integer number (2735575920).

Almost surely, 2^136665436243 is an apocalyptic number.

136665436243 is a deficient number, since it is larger than the sum of its proper divisors (38411422637).

136665436243 is a wasteful number, since it uses less digits than its factorization.

136665436243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8348.

The product of its digits is 5598720, while the sum is 49.

The spelling of 136665436243 in words is "one hundred thirty-six billion, six hundred sixty-five million, four hundred thirty-six thousand, two hundred forty-three".