13455121324523 has 4 divisors (see below), whose sum is σ = 13463785280568. Its totient is φ = 13446457368480.

The previous prime is 13455121324441. The next prime is 13455121324543. The reversal of 13455121324523 is 32542312155431.

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

It is a cyclic number.

It is not a de Polignac number, because 13455121324523 - 2¹⁶ = 13455121258987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13455121324543) 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, 4331975693 + ... + 4331978798.

It is an arithmetic number, because the mean of its divisors is an integer number (3365946320142).

Almost surely, 2^{13455121324523} is an apocalyptic number.

13455121324523 is a deficient number, since it is larger than the sum of its proper divisors (8663956045).

13455121324523 is an equidigital number, since it uses as much as digits as its factorization.

13455121324523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8663956044.

The product of its digits is 432000, while the sum is 41.

Adding to 13455121324523 its reverse (32542312155431), we get a palindrome (45997433479954).

The spelling of 13455121324523 in words is "thirteen trillion, four hundred fifty-five billion, one hundred twenty-one million, three hundred twenty-four thousand, five hundred twenty-three".