638848321566 has 32 divisors (see below), whose sum is σ = 1572549715968. Its totient is φ = 168487469280.

The previous prime is 638848321547. The next prime is 638848321589. The reversal of 638848321566 is 665123848836.

638848321566 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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, 585025390 + ... + 585026481.

It is an arithmetic number, because the mean of its divisors is an integer number (49142178624).

Almost surely, 2^638848321566 is an apocalyptic number.

638848321566 is an abundant number, since it is smaller than the sum of its proper divisors (933701394402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638848321566 is a wasteful number, since it uses less digits than its factorization.

638848321566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170051896.

The product of its digits is 39813120, while the sum is 60.

The spelling of 638848321566 in words is "six hundred thirty-eight billion, eight hundred forty-eight million, three hundred twenty-one thousand, five hundred sixty-six".