12049209161 has 12 divisors (see below), whose sum is σ = 13281738036. Its totient is φ = 10922757120.

The previous prime is 12049209149. The next prime is 12049209163. The reversal of 12049209161 is 16190294021.

It can be written as a sum of positive squares in 2 ways, for example, as 3183103561 + 8866105600 = 56419^2 + 94160^2 .

It is not a de Polignac number, because 12049209161 - 2¹⁸ = 12048947017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12049209163) 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, 98336 + ... + 183761.

It is an arithmetic number, because the mean of its divisors is an integer number (1106811503).

Almost surely, 2^12049209161 is an apocalyptic number.

12049209161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12049209161 is a deficient number, since it is larger than the sum of its proper divisors (1232528875).

12049209161 is a wasteful number, since it uses less digits than its factorization.

12049209161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282472 (or 282461 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 12049209161 in words is "twelve billion, forty-nine million, two hundred nine thousand, one hundred sixty-one".