12641991169 has 4 divisors (see below), whose sum is σ = 12983666644. Its totient is φ = 12300315696.

The previous prime is 12641991149. The next prime is 12641991179. The reversal of 12641991169 is 96119914621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11899973569 + 742017600 = 109087^2 + 27240^2 .

It is a cyclic number.

It is not a de Polignac number, because 12641991169 - 2⁵ = 12641991137 is a prime.

It is a super-2 number, since 2×12641991169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12641991149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170837682 + ... + 170837755.

It is an arithmetic number, because the mean of its divisors is an integer number (3245916661).

Almost surely, 2^12641991169 is an apocalyptic number.

It is an amenable number.

12641991169 is a deficient number, since it is larger than the sum of its proper divisors (341675475).

12641991169 is an equidigital number, since it uses as much as digits as its factorization.

12641991169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341675474.

The product of its digits is 209952, while the sum is 49.

The spelling of 12641991169 in words is "twelve billion, six hundred forty-one million, nine hundred ninety-one thousand, one hundred sixty-nine".