638863468038 has 12 divisors (see below), whose sum is σ = 1384204180788. Its totient is φ = 212954489340.

The previous prime is 638863468037. The next prime is 638863468057. The reversal of 638863468038 is 830864368836.

638863468038 is a `hidden beast` number, since 6 + 3 + 88 + 63 + 468 + 0 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638863468037) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17746207428 + ... + 17746207463.

It is an arithmetic number, because the mean of its divisors is an integer number (115350348399).

Almost surely, 2^638863468038 is an apocalyptic number.

638863468038 is an abundant number, since it is smaller than the sum of its proper divisors (745340712750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638863468038 is a wasteful number, since it uses less digits than its factorization.

638863468038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35492414899 (or 35492414896 counting only the distinct ones).

The product of its (nonzero) digits is 95551488, while the sum is 63.

The spelling of 638863468038 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, four hundred sixty-eight thousand, thirty-eight".