12638858347909 has 2 divisors, whose sum is σ = 12638858347910. Its totient is φ = 12638858347908.

The previous prime is 12638858347799. The next prime is 12638858347987. The reversal of 12638858347909 is 90974385883621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9884327284225 + 2754531063684 = 3143935^2 + 1659678^2 .

It is a cyclic number.

It is not a de Polignac number, because 12638858347909 - 2⁷ = 12638858347781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638858347109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319429173954 + 6319429173955.

It is an arithmetic number, because the mean of its divisors is an integer number (6319429173955).

It is a 1-persistent number, because it is pandigital, but 2⋅12638858347909 = 25277716695818 is not.

Almost surely, 2^{12638858347909} is an apocalyptic number.

It is an amenable number.

12638858347909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638858347909 is an equidigital number, since it uses as much as digits as its factorization.

12638858347909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 627056640, while the sum is 73.

The spelling of 12638858347909 in words is "twelve trillion, six hundred thirty-eight billion, eight hundred fifty-eight million, three hundred forty-seven thousand, nine hundred nine".