12643749169 has 2 divisors, whose sum is σ = 12643749170. Its totient is φ = 12643749168.

The previous prime is 12643749149. The next prime is 12643749193. The reversal of 12643749169 is 96194734621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11006737569 + 1637011600 = 104913^2 + 40460^2 .

It is a cyclic number.

It is not a de Polignac number, because 12643749169 - 2²³ = 12635360561 is a prime.

It is a super-2 number, since 2×12643749169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12643749109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321874584 + 6321874585.

It is an arithmetic number, because the mean of its divisors is an integer number (6321874585).

Almost surely, 2^12643749169 is an apocalyptic number.

It is an amenable number.

12643749169 is a deficient number, since it is larger than the sum of its proper divisors (1).

12643749169 is an equidigital number, since it uses as much as digits as its factorization.

12643749169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 52.

The spelling of 12643749169 in words is "twelve billion, six hundred forty-three million, seven hundred forty-nine thousand, one hundred sixty-nine".