13112544561 has 16 divisors (see below), whose sum is σ = 18100454400. Its totient is φ = 8433638528.

The previous prime is 13112544551. The next prime is 13112544569. The reversal of 13112544561 is 16544521131.

It is a cyclic number.

It is not a de Polignac number, because 13112544561 - 2¹⁰ = 13112543537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13112544569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53680 + ... + 170606.

It is an arithmetic number, because the mean of its divisors is an integer number (1131278400).

Almost surely, 2^13112544561 is an apocalyptic number.

It is an amenable number.

13112544561 is a deficient number, since it is larger than the sum of its proper divisors (4987909839).

13112544561 is a wasteful number, since it uses less digits than its factorization.

13112544561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118248.

The product of its digits is 14400, while the sum is 33.

The spelling of 13112544561 in words is "thirteen billion, one hundred twelve million, five hundred forty-four thousand, five hundred sixty-one".