638821778114 has 32 divisors (see below), whose sum is σ = 1080783696384. Its totient is φ = 280980912960.

The previous prime is 638821778087. The next prime is 638821778149. The reversal of 638821778114 is 411877128836.

638821778114 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 638821778114.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1808909 + ... + 2133024.

It is an arithmetic number, because the mean of its divisors is an integer number (33774490512).

Almost surely, 2^638821778114 is an apocalyptic number.

638821778114 is a deficient number, since it is larger than the sum of its proper divisors (441961918270).

638821778114 is a wasteful number, since it uses less digits than its factorization.

638821778114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3942242.

The product of its digits is 3612672, while the sum is 56.

The spelling of 638821778114 in words is "six hundred thirty-eight billion, eight hundred twenty-one million, seven hundred seventy-eight thousand, one hundred fourteen".