135523021255 has 16 divisors (see below), whose sum is σ = 164853198720. Its totient is φ = 106938927648.

The previous prime is 135523021223. The next prime is 135523021297. The reversal of 135523021255 is 552120325531.

It is a cyclic number.

It is not a de Polignac number, because 135523021255 - 2⁵ = 135523021223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135523021255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6897 + ... + 520666.

It is an arithmetic number, because the mean of its divisors is an integer number (10303324920).

Almost surely, 2^135523021255 is an apocalyptic number.

135523021255 is a deficient number, since it is larger than the sum of its proper divisors (29330177465).

135523021255 is an equidigital number, since it uses as much as digits as its factorization.

135523021255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528270.

The product of its (nonzero) digits is 45000, while the sum is 34.

Adding to 135523021255 its reverse (552120325531), we get a palindrome (687643346786).

The spelling of 135523021255 in words is "one hundred thirty-five billion, five hundred twenty-three million, twenty-one thousand, two hundred fifty-five".