12638003635 has 4 divisors (see below), whose sum is σ = 15165604368. Its totient is φ = 10110402904.

The previous prime is 12638003633. The next prime is 12638003659. The reversal of 12638003635 is 53630083621.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12638003635 - 2¹ = 12638003633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12638003594 and 12638003603.

It is not an unprimeable number, because it can be changed into a prime (12638003633) 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, 1263800359 + ... + 1263800368.

It is an arithmetic number, because the mean of its divisors is an integer number (3791401092).

Almost surely, 2^12638003635 is an apocalyptic number.

12638003635 is a deficient number, since it is larger than the sum of its proper divisors (2527600733).

12638003635 is an equidigital number, since it uses as much as digits as its factorization.

12638003635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527600732.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 12638003635 in words is "twelve billion, six hundred thirty-eight million, three thousand, six hundred thirty-five".