135336565721 has 16 divisors (see below), whose sum is σ = 159274896000. Its totient is φ = 114938493264.

The previous prime is 135336565687. The next prime is 135336565747. The reversal of 135336565721 is 127565633531.

It is a de Polignac number, because none of the positive numbers 2^k-135336565721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135336565421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1772555 + ... + 1847328.

It is an arithmetic number, because the mean of its divisors is an integer number (9954681000).

Almost surely, 2^135336565721 is an apocalyptic number.

It is an amenable number.

135336565721 is a deficient number, since it is larger than the sum of its proper divisors (23938330279).

135336565721 is an equidigital number, since it uses as much as digits as its factorization.

135336565721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3620013 (or 3619999 counting only the distinct ones).

The product of its digits is 1701000, while the sum is 47.

The spelling of 135336565721 in words is "one hundred thirty-five billion, three hundred thirty-six million, five hundred sixty-five thousand, seven hundred twenty-one".