13272542561 has 4 divisors (see below), whose sum is σ = 13272897300. Its totient is φ = 13272187824.

The previous prime is 13272542557. The next prime is 13272542573. The reversal of 13272542561 is 16524527231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16524527231 = 587 ⋅28150813.

It can be written as a sum of positive squares in 2 ways, for example, as 10973819536 + 2298723025 = 104756^2 + 47945^2 .

It is a cyclic number.

It is not a de Polignac number, because 13272542561 - 2² = 13272542557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13272542551) 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, 113606 + ... + 198623.

It is an arithmetic number, because the mean of its divisors is an integer number (3318224325).

Almost surely, 2^13272542561 is an apocalyptic number.

It is an amenable number.

13272542561 is a deficient number, since it is larger than the sum of its proper divisors (354739).

13272542561 is an equidigital number, since it uses as much as digits as its factorization.

13272542561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354738.

The product of its digits is 100800, while the sum is 38.

The spelling of 13272542561 in words is "thirteen billion, two hundred seventy-two million, five hundred forty-two thousand, five hundred sixty-one".