13573264561 has 6 divisors (see below), whose sum is σ = 13868204210. Its totient is φ = 13284469536.

The previous prime is 13573264547. The next prime is 13573264583. The reversal of 13573264561 is 16546237531.

It can be written as a sum of positive squares in only one way, i.e., 11889721600 + 1683542961 = 109040^2 + 41031^2 .

It is not a de Polignac number, because 13573264561 - 2¹⁹ = 13572740273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13573264591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3070056 + ... + 3074473.

Almost surely, 2^13573264561 is an apocalyptic number.

It is an amenable number.

13573264561 is a deficient number, since it is larger than the sum of its proper divisors (294939649).

13573264561 is an frugal number, since it uses more digits than its factorization.

13573264561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6144623 (or 6144576 counting only the distinct ones).

The product of its digits is 453600, while the sum is 43.

The spelling of 13573264561 in words is "thirteen billion, five hundred seventy-three million, two hundred sixty-four thousand, five hundred sixty-one".