638584863227 has 16 divisors (see below), whose sum is σ = 667049021184. Its totient is φ = 610655760000.

The previous prime is 638584863181. The next prime is 638584863299. The reversal of 638584863227 is 722368485836.

It is a cyclic number.

It is not a de Polignac number, because 638584863227 - 2¹⁴ = 638584846843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638584863227.

It is not an unprimeable number, because it can be changed into a prime (638584883227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518477 + ... + 1243377.

It is an arithmetic number, because the mean of its divisors is an integer number (41690563824).

Almost surely, 2^638584863227 is an apocalyptic number.

638584863227 is a deficient number, since it is larger than the sum of its proper divisors (28464157957).

638584863227 is a wasteful number, since it uses less digits than its factorization.

638584863227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725270.

The product of its digits is 92897280, while the sum is 62.

The spelling of 638584863227 in words is "six hundred thirty-eight billion, five hundred eighty-four million, eight hundred sixty-three thousand, two hundred twenty-seven".