12638378845 has 8 divisors (see below), whose sum is σ = 15188263776. Its totient is φ = 10095896976.

The previous prime is 12638378839. The next prime is 12638378861. The reversal of 12638378845 is 54887383621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12638378845 - 2⁷ = 12638378717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1847007 + ... + 1853836.

It is an arithmetic number, because the mean of its divisors is an integer number (1898532972).

Almost surely, 2^12638378845 is an apocalyptic number.

It is an amenable number.

12638378845 is a deficient number, since it is larger than the sum of its proper divisors (2549884931).

12638378845 is an equidigital number, since it uses as much as digits as its factorization.

12638378845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3701531.

The product of its digits is 7741440, while the sum is 55.

The spelling of 12638378845 in words is "twelve billion, six hundred thirty-eight million, three hundred seventy-eight thousand, eight hundred forty-five".