13161210813 has 12 divisors (see below), whose sum is σ = 19032935740. Its totient is φ = 8763849216.

The previous prime is 13161210793. The next prime is 13161210823. The reversal of 13161210813 is 31801216131.

13161210813 is a `hidden beast` number, since 1 + 31 + 612 + 1 + 0 + 8 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3304295289 + 9856915524 = 57483^2 + 99282^2 .

It is not a de Polignac number, because 13161210813 - 2²⁰ = 13160162237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13161210823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 849508 + ... + 864861.

Almost surely, 2^13161210813 is an apocalyptic number.

It is an amenable number.

13161210813 is a deficient number, since it is larger than the sum of its proper divisors (5871724927).

13161210813 is a wasteful number, since it uses less digits than its factorization.

13161210813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715228 (or 1715225 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

Adding to 13161210813 its reverse (31801216131), we get a palindrome (44962426944).

The spelling of 13161210813 in words is "thirteen billion, one hundred sixty-one million, two hundred ten thousand, eight hundred thirteen".