638583223205 has 16 divisors (see below), whose sum is σ = 797773227120. Its totient is φ = 490108749312.

The previous prime is 638583223193. The next prime is 638583223211. The reversal of 638583223205 is 502322385836.

638583223205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 29374874881 + 609208348324 = 171391^2 + 780518^2 .

It is a cyclic number.

It is not a de Polignac number, because 638583223205 - 2⁴ = 638583223189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638583223205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14002784 + ... + 14048313.

It is an arithmetic number, because the mean of its divisors is an integer number (49860826695).

Almost surely, 2^638583223205 is an apocalyptic number.

It is an amenable number.

638583223205 is a deficient number, since it is larger than the sum of its proper divisors (159190003915).

638583223205 is a wasteful number, since it uses less digits than its factorization.

638583223205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28051288.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 638583223205 in words is "six hundred thirty-eight billion, five hundred eighty-three million, two hundred twenty-three thousand, two hundred five".