135135724585 has 4 divisors (see below), whose sum is σ = 162162869508. Its totient is φ = 108108579664.

The previous prime is 135135724541. The next prime is 135135724589. The reversal of 135135724585 is 585427531531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 585427531531 = 98347 ⋅5952673.

It can be written as a sum of positive squares in 2 ways, for example, as 37959508224 + 97176216361 = 194832^2 + 311731^2 .

It is a cyclic number.

It is not a de Polignac number, because 135135724585 - 2⁷ = 135135724457 is a prime.

It is a super-2 number, since 2×135135724585² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135135724589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13513572454 + ... + 13513572463.

It is an arithmetic number, because the mean of its divisors is an integer number (40540717377).

Almost surely, 2^135135724585 is an apocalyptic number.

It is an amenable number.

135135724585 is a deficient number, since it is larger than the sum of its proper divisors (27027144923).

135135724585 is an equidigital number, since it uses as much as digits as its factorization.

135135724585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27027144922.

The product of its digits is 2520000, while the sum is 49.

The spelling of 135135724585 in words is "one hundred thirty-five billion, one hundred thirty-five million, seven hundred twenty-four thousand, five hundred eighty-five".