135171228205 has 48 divisors (see below), whose sum is σ = 180863429040. Its totient is φ = 96394281984.

The previous prime is 135171228161. The next prime is 135171228217. The reversal of 135171228205 is 502822171531.

It can be written as a sum of positive squares in 8 ways, for example, as 51723040329 + 83448187876 = 227427^2 + 288874^2 .

It is not a de Polignac number, because 135171228205 - 2⁷ = 135171228077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10690147 + ... + 10702783.

It is an arithmetic number, because the mean of its divisors is an integer number (3767988105).

Almost surely, 2^135171228205 is an apocalyptic number.

It is an amenable number.

135171228205 is a deficient number, since it is larger than the sum of its proper divisors (45692200835).

135171228205 is a wasteful number, since it uses less digits than its factorization.

135171228205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12830 (or 12787 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

Adding to 135171228205 its reverse (502822171531), we get a palindrome (637993399736).

The spelling of 135171228205 in words is "one hundred thirty-five billion, one hundred seventy-one million, two hundred twenty-eight thousand, two hundred five".