12638876449 has 4 divisors (see below), whose sum is σ = 12827516464. Its totient is φ = 12450236436.

The previous prime is 12638876431. The next prime is 12638876531. The reversal of 12638876449 is 94467883621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12638876449 - 2¹³ = 12638868257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12638876393 and 12638876402.

It is not an unprimeable number, because it can be changed into a prime (12638876749) 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, 94319907 + ... + 94320040.

It is an arithmetic number, because the mean of its divisors is an integer number (3206879116).

Almost surely, 2^12638876449 is an apocalyptic number.

It is an amenable number.

12638876449 is a deficient number, since it is larger than the sum of its proper divisors (188640015).

12638876449 is an equidigital number, since it uses as much as digits as its factorization.

12638876449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188640014.

The product of its digits is 13934592, while the sum is 58.

The spelling of 12638876449 in words is "twelve billion, six hundred thirty-eight million, eight hundred seventy-six thousand, four hundred forty-nine".