638353664422 has 8 divisors (see below), whose sum is σ = 971016841872. Its totient is φ = 314681383800.

The previous prime is 638353664419. The next prime is 638353664447. The reversal of 638353664422 is 224466353836.

638353664422 is digitally balanced in base 2, 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 self number, because there is not a number n which added to its sum of digits gives 638353664422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2247724029 + ... + 2247724312.

It is an arithmetic number, because the mean of its divisors is an integer number (121377105234).

Almost surely, 2^638353664422 is an apocalyptic number.

638353664422 is a deficient number, since it is larger than the sum of its proper divisors (332663177450).

638353664422 is a wasteful number, since it uses less digits than its factorization.

638353664422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495448414.

The product of its digits is 14929920, while the sum is 52.

The spelling of 638353664422 in words is "six hundred thirty-eight billion, three hundred fifty-three million, six hundred sixty-four thousand, four hundred twenty-two".