638545875018 has 8 divisors (see below), whose sum is σ = 1277091750048. Its totient is φ = 212848625004.

The previous prime is 638545875001. The next prime is 638545875029. The reversal of 638545875018 is 810578545836.

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

638545875018 is an admirable 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, 53212156246 + ... + 53212156257.

It is an arithmetic number, because the mean of its divisors is an integer number (159636468756).

Almost surely, 2^638545875018 is an apocalyptic number.

638545875018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638545875018 is a wasteful number, since it uses less digits than its factorization.

638545875018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106424312508.

The product of its (nonzero) digits is 32256000, while the sum is 60.

The spelling of 638545875018 in words is "six hundred thirty-eight billion, five hundred forty-five million, eight hundred seventy-five thousand, eighteen".