135581145569 has 4 divisors (see below), whose sum is σ = 138888002820. Its totient is φ = 132274288320.

The previous prime is 135581145541. The next prime is 135581145577. The reversal of 135581145569 is 965541185531.

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 1854163600 + 133726981969 = 43060^2 + 365687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135581145569 is a prime.

It is a super-2 number, since 2×135581145569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 135581145569.

It is not an unprimeable number, because it can be changed into a prime (135581145599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1653428564 + ... + 1653428645.

It is an arithmetic number, because the mean of its divisors is an integer number (34722000705).

Almost surely, 2^135581145569 is an apocalyptic number.

It is an amenable number.

135581145569 is a deficient number, since it is larger than the sum of its proper divisors (3306857251).

135581145569 is an equidigital number, since it uses as much as digits as its factorization.

135581145569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306857250.

The product of its digits is 3240000, while the sum is 53.

The spelling of 135581145569 in words is "one hundred thirty-five billion, five hundred eighty-one million, one hundred forty-five thousand, five hundred sixty-nine".