12438645691 has 2 divisors, whose sum is σ = 12438645692. Its totient is φ = 12438645690.

The previous prime is 12438645673. The next prime is 12438645719. The reversal of 12438645691 is 19654683421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12438645691 - 2⁹ = 12438645179 is a prime.

It is not a weakly prime, because it can be changed into another prime (12438645671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6219322845 + 6219322846.

It is an arithmetic number, because the mean of its divisors is an integer number (6219322846).

Almost surely, 2^12438645691 is an apocalyptic number.

12438645691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12438645691 is an equidigital number, since it uses as much as digits as its factorization.

12438645691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 49.

The spelling of 12438645691 in words is "twelve billion, four hundred thirty-eight million, six hundred forty-five thousand, six hundred ninety-one".