638863468012 has 72 divisors (see below), whose sum is σ = 1405323198720. Its totient is φ = 248751967200.

The previous prime is 638863468003. The next prime is 638863468021. The reversal of 638863468012 is 210864368836.

It is an interprime number because it is at equal distance from previous prime (638863468003) and next prime (638863468021).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5426937 + ... + 5543407.

It is an arithmetic number, because the mean of its divisors is an integer number (19518377760).

Almost surely, 2^638863468012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638863468012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702661599360).

638863468012 is an abundant number, since it is smaller than the sum of its proper divisors (766459730708).

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

638863468012 is a wasteful number, since it uses less digits than its factorization.

638863468012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118123 (or 118110 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 55.

The spelling of 638863468012 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, four hundred sixty-eight thousand, twelve".