12638639456 has 12 divisors (see below), whose sum is σ = 24882321492. Its totient is φ = 6319319712.

The previous prime is 12638639441. The next prime is 12638639467. The reversal of 12638639456 is 65493683621.

It is a junction number, because it is equal to n+sod(n) for n = 12638639398 and 12638639407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197478710 + ... + 197478773.

It is an arithmetic number, because the mean of its divisors is an integer number (2073526791).

Almost surely, 2^12638639456 is an apocalyptic number.

12638639456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12638639456 is a deficient number, since it is larger than the sum of its proper divisors (12243682036).

12638639456 is an equidigital number, since it uses as much as digits as its factorization.

12638639456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394957493 (or 394957485 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 53.

The spelling of 12638639456 in words is "twelve billion, six hundred thirty-eight million, six hundred thirty-nine thousand, four hundred fifty-six".