13565959729 has 15 divisors (see below), whose sum is σ = 15832672107. Its totient is φ = 11623073616.

The previous prime is 13565959723. The next prime is 13565959753. The reversal of 13565959729 is 92795956531.

The square root of 13565959729 is 116473.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5366295025 + 8199664704 = 73255^2 + 90552^2 .

It is not a de Polignac number, because 13565959729 - 2²⁷ = 13431742001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13565959723) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5705989 + ... + 5708365.

Almost surely, 2^13565959729 is an apocalyptic number.

13565959729 is the 116473-rd square number.

13565959729 is the 58237-th centered octagonal number.

It is an amenable number.

13565959729 is a deficient number, since it is larger than the sum of its proper divisors (2266712378).

13565959729 is an frugal number, since it uses more digits than its factorization.

13565959729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782 (or 2384 counting only the distinct ones).

The product of its digits is 22963500, while the sum is 61.

The spelling of 13565959729 in words is "thirteen billion, five hundred sixty-five million, nine hundred fifty-nine thousand, seven hundred twenty-nine".