135243545405 has 4 divisors (see below), whose sum is σ = 162292254492. Its totient is φ = 108194836320.

The previous prime is 135243545377. The next prime is 135243545443. The reversal of 135243545405 is 504545342531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82186569124 + 53056976281 = 286682^2 + 230341^2 .

It is not a de Polignac number, because 135243545405 - 2¹⁴ = 135243529021 is a prime.

It is a super-2 number, since 2×135243545405² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13524354536 + ... + 13524354545.

It is an arithmetic number, because the mean of its divisors is an integer number (40573063623).

Almost surely, 2^135243545405 is an apocalyptic number.

It is an amenable number.

135243545405 is a deficient number, since it is larger than the sum of its proper divisors (27048709087).

135243545405 is an equidigital number, since it uses as much as digits as its factorization.

135243545405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27048709086.

The product of its (nonzero) digits is 720000, while the sum is 41.

Adding to 135243545405 its reverse (504545342531), we get a palindrome (639788887936).

The spelling of 135243545405 in words is "one hundred thirty-five billion, two hundred forty-three million, five hundred forty-five thousand, four hundred five".