11512161205 has 4 divisors (see below), whose sum is σ = 13814593452. Its totient is φ = 9209728960.

The previous prime is 11512161163. The next prime is 11512161211. The reversal of 11512161205 is 50216121511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50216121511 = 433 ⋅115972567.

It can be written as a sum of positive squares in 2 ways, for example, as 8717770161 + 2794391044 = 93369^2 + 52862^2 .

It is not a de Polignac number, because 11512161205 - 2²¹ = 11510064053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11512161205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151216116 + ... + 1151216125.

It is an arithmetic number, because the mean of its divisors is an integer number (3453648363).

Almost surely, 2^11512161205 is an apocalyptic number.

It is an amenable number.

11512161205 is a deficient number, since it is larger than the sum of its proper divisors (2302432247).

11512161205 is an equidigital number, since it uses as much as digits as its factorization.

11512161205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302432246.

The product of its (nonzero) digits is 600, while the sum is 25.

Adding to 11512161205 its reverse (50216121511), we get a palindrome (61728282716).

The spelling of 11512161205 in words is "eleven billion, five hundred twelve million, one hundred sixty-one thousand, two hundred five".