13045451535521 has 4 divisors (see below), whose sum is σ = 13045466068992. Its totient is φ = 13045437002052.

The previous prime is 13045451535511. The next prime is 13045451535541. The reversal of 13045451535521 is 12553515454031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13045451535521 - 2¹⁴ = 13045451519137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13045451535511) 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, 5824961 + ... + 7747326.

It is an arithmetic number, because the mean of its divisors is an integer number (3261366517248).

Almost surely, 2^{13045451535521} is an apocalyptic number.

It is an amenable number.

13045451535521 is a deficient number, since it is larger than the sum of its proper divisors (14533471).

13045451535521 is an equidigital number, since it uses as much as digits as its factorization.

13045451535521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14533470.

The product of its (nonzero) digits is 900000, while the sum is 44.

Adding to 13045451535521 its reverse (12553515454031), we get a palindrome (25598966989552).

The spelling of 13045451535521 in words is "thirteen trillion, forty-five billion, four hundred fifty-one million, five hundred thirty-five thousand, five hundred twenty-one".