11521535240345 has 16 divisors (see below), whose sum is σ = 15170300106192. Its totient is φ = 8347678360320.

The previous prime is 11521535240329. The next prime is 11521535240359. The reversal of 11521535240345 is 54304253512511.

It can be written as a sum of positive squares in 8 ways, for example, as 102894034441 + 11418641205904 = 320771^2 + 3379148^2 .

It is not a de Polignac number, because 11521535240345 - 2⁴ = 11521535240329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1672207766 + ... + 1672214655.

It is an arithmetic number, because the mean of its divisors is an integer number (948143756637).

Almost surely, 2^{11521535240345} is an apocalyptic number.

It is an amenable number.

11521535240345 is a deficient number, since it is larger than the sum of its proper divisors (3648764865847).

11521535240345 is a wasteful number, since it uses less digits than its factorization.

11521535240345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344422492.

The product of its (nonzero) digits is 360000, while the sum is 41.

Adding to 11521535240345 its reverse (54304253512511), we get a palindrome (65825788752856).

The spelling of 11521535240345 in words is "eleven trillion, five hundred twenty-one billion, five hundred thirty-five million, two hundred forty thousand, three hundred forty-five".