135238181605 has 8 divisors (see below), whose sum is σ = 162994491000. Its totient is φ = 107718096576.

The previous prime is 135238181581. The next prime is 135238181633. The reversal of 135238181605 is 506181832531.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 57616321156 + 77621860449 = 240034^2 + 278607^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 135238181605 - 2⁹ = 135238181093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59054830 + ... + 59057119.

It is an arithmetic number, because the mean of its divisors is an integer number (20374311375).

Almost surely, 2^135238181605 is an apocalyptic number.

It is an amenable number.

135238181605 is a deficient number, since it is larger than the sum of its proper divisors (27756309395).

135238181605 is a wasteful number, since it uses less digits than its factorization.

135238181605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118112183.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 135238181605 in words is "one hundred thirty-five billion, two hundred thirty-eight million, one hundred eighty-one thousand, six hundred five".