136665173 has 2 divisors, whose sum is σ = 136665174. Its totient is φ = 136665172.

The previous prime is 136665169. The next prime is 136665187. The reversal of 136665173 is 371566631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92602129 + 44063044 = 9623^2 + 6638^2 .

It is a cyclic number.

It is not a de Polignac number, because 136665173 - 2² = 136665169 is a prime.

It is a super-2 number, since 2×136665173² = 37354739022239858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136665973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68332586 + 68332587.

It is an arithmetic number, because the mean of its divisors is an integer number (68332587).

Almost surely, 2^136665173 is an apocalyptic number.

It is an amenable number.

136665173 is a deficient number, since it is larger than the sum of its proper divisors (1).

136665173 is an equidigital number, since it uses as much as digits as its factorization.

136665173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

The square root of 136665173 is about 11690.3880602827. The cubic root of 136665173 is about 515.0933603955.

The spelling of 136665173 in words is "one hundred thirty-six million, six hundred sixty-five thousand, one hundred seventy-three".