12639887798 has 8 divisors (see below), whose sum is σ = 18960940080. Its totient is φ = 6319574440.

The previous prime is 12639887791. The next prime is 12639887803. The reversal of 12639887798 is 89778893621.

12639887798 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639887791) 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, 139778 + ... + 211701.

It is an arithmetic number, because the mean of its divisors is an integer number (2370117510).

Almost surely, 2^12639887798 is an apocalyptic number.

12639887798 is a deficient number, since it is larger than the sum of its proper divisors (6321052282).

12639887798 is a wasteful number, since it uses less digits than its factorization.

12639887798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369462.

The product of its digits is 73156608, while the sum is 68.

The spelling of 12639887798 in words is "twelve billion, six hundred thirty-nine million, eight hundred eighty-seven thousand, seven hundred ninety-eight".