13662826561 has 4 divisors (see below), whose sum is σ = 13749851092. Its totient is φ = 13575802032.

The previous prime is 13662826559. The next prime is 13662826601. The reversal of 13662826561 is 16562826631.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5250451600 + 8412374961 = 72460^2 + 91719^2 .

It is a cyclic number.

It is not a de Polignac number, because 13662826561 - 2¹ = 13662826559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13662826061) 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, 43512030 + ... + 43512343.

It is an arithmetic number, because the mean of its divisors is an integer number (3437462773).

Almost surely, 2^13662826561 is an apocalyptic number.

It is an amenable number.

13662826561 is a deficient number, since it is larger than the sum of its proper divisors (87024531).

13662826561 is an equidigital number, since it uses as much as digits as its factorization.

13662826561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87024530.

The product of its digits is 622080, while the sum is 46.

The spelling of 13662826561 in words is "thirteen billion, six hundred sixty-two million, eight hundred twenty-six thousand, five hundred sixty-one".