135008255581 has 32 divisors (see below), whose sum is σ = 151030020960. Its totient is φ = 120082120704.

The previous prime is 135008255573. The next prime is 135008255609. The reversal of 135008255581 is 185552800531.

It can be written as a sum of positive squares in 16 ways, for example, as 3032264356 + 131975991225 = 55066^2 + 363285^2 .

It is a cyclic number.

It is not a de Polignac number, because 135008255581 - 2³ = 135008255573 is a prime.

It is a super-2 number, since 2×135008255581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135008255531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11307891 + ... + 11319823.

It is an arithmetic number, because the mean of its divisors is an integer number (4719688155).

Almost surely, 2^135008255581 is an apocalyptic number.

It is an amenable number.

135008255581 is a deficient number, since it is larger than the sum of its proper divisors (16021765379).

135008255581 is a wasteful number, since it uses less digits than its factorization.

135008255581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12465.

The product of its (nonzero) digits is 240000, while the sum is 43.

The spelling of 135008255581 in words is "one hundred thirty-five billion, eight million, two hundred fifty-five thousand, five hundred eighty-one".