13865769009 has 9 divisors (see below), whose sum is σ = 20028843289. Its totient is φ = 9243610500.

The previous prime is 13865768971. The next prime is 13865769013. The reversal of 13865769009 is 90096756831.

The square root of 13865769009 is 117753.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 13865769009 - 2²⁹ = 13328898097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13865769209) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 333634 + ... + 372884.

Almost surely, 2^13865769009 is an apocalyptic number.

13865769009 is the 117753-rd square number.

13865769009 is the 58877-th centered octagonal number.

It is an amenable number.

13865769009 is a deficient number, since it is larger than the sum of its proper divisors (6163074280).

13865769009 is an frugal number, since it uses more digits than its factorization.

13865769009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78508 (or 39254 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 13865769009 in words is "thirteen billion, eight hundred sixty-five million, seven hundred sixty-nine thousand, nine".