638822208873 has 4 divisors (see below), whose sum is σ = 851762945168. Its totient is φ = 425881472580.

The previous prime is 638822208859. The next prime is 638822208883. The reversal of 638822208873 is 378802228836.

638822208873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 638822208873 - 2²⁰ = 638821160297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638822208883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106470368143 + ... + 106470368148.

It is an arithmetic number, because the mean of its divisors is an integer number (212940736292).

Almost surely, 2^638822208873 is an apocalyptic number.

It is an amenable number.

638822208873 is a deficient number, since it is larger than the sum of its proper divisors (212940736295).

638822208873 is a wasteful number, since it uses less digits than its factorization.

638822208873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212940736294.

The product of its (nonzero) digits is 12386304, while the sum is 57.

The spelling of 638822208873 in words is "six hundred thirty-eight billion, eight hundred twenty-two million, two hundred eight thousand, eight hundred seventy-three".