638863810467 has 8 divisors (see below), whose sum is σ = 851828477520. Its totient is φ = 425904175200.

The previous prime is 638863810447. The next prime is 638863810477. The reversal of 638863810467 is 764018368836.

638863810467 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 not a de Polignac number, because 638863810467 - 2⁷ = 638863810339 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 638863810467.

It is not an unprimeable number, because it can be changed into a prime (638863810447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950992 + ... + 1477197.

It is an arithmetic number, because the mean of its divisors is an integer number (106478559690).

Almost surely, 2^638863810467 is an apocalyptic number.

638863810467 is a deficient number, since it is larger than the sum of its proper divisors (212964667053).

638863810467 is a wasteful number, since it uses less digits than its factorization.

638863810467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515893.

The product of its (nonzero) digits is 27869184, while the sum is 60.

The spelling of 638863810467 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, eight hundred ten thousand, four hundred sixty-seven".