13165565515 has 16 divisors (see below), whose sum is σ = 16231068288. Its totient is φ = 10244382336.

The previous prime is 13165565507. The next prime is 13165565521. The reversal of 13165565515 is 51556556131.

It is a cyclic number.

It is not a de Polignac number, because 13165565515 - 2³ = 13165565507 is a prime.

It is a super-3 number, since 3×13165565515³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 643534 + ... + 663676.

It is an arithmetic number, because the mean of its divisors is an integer number (1014441768).

Almost surely, 2^13165565515 is an apocalyptic number.

13165565515 is a deficient number, since it is larger than the sum of its proper divisors (3065502773).

13165565515 is a wasteful number, since it uses less digits than its factorization.

13165565515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23718.

The product of its digits is 337500, while the sum is 43.

The spelling of 13165565515 in words is "thirteen billion, one hundred sixty-five million, five hundred sixty-five thousand, five hundred fifteen".