638844867027 has 10 divisors (see below), whose sum is σ = 954323813828. Its totient is φ = 425896577964.

The previous prime is 638844866999. The next prime is 638844867079. The reversal of 638844867027 is 720768448836.

638844867027 is a `hidden beast` number, since 6 + 3 + 8 + 84 + 486 + 70 + 2 + 7 = 666.

It is not a de Polignac number, because 638844867027 - 2¹⁹ = 638844342739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638844867097) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3943486753 + ... + 3943486914.

Almost surely, 2^638844867027 is an apocalyptic number.

638844867027 is a deficient number, since it is larger than the sum of its proper divisors (315478946801).

638844867027 is an equidigital number, since it uses as much as digits as its factorization.

638844867027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7886973679 (or 7886973670 counting only the distinct ones).

The product of its (nonzero) digits is 86704128, while the sum is 63.

The spelling of 638844867027 in words is "six hundred thirty-eight billion, eight hundred forty-four million, eight hundred sixty-seven thousand, twenty-seven".