638927099806 has 16 divisors (see below), whose sum is σ = 1000830957984. Its totient is φ = 305338201344.

The previous prime is 638927099803. The next prime is 638927099813. The reversal of 638927099806 is 608990729836.

638927099806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638927099803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5294895 + ... + 5414218.

It is an arithmetic number, because the mean of its divisors is an integer number (62551934874).

Almost surely, 2^638927099806 is an apocalyptic number.

638927099806 is a deficient number, since it is larger than the sum of its proper divisors (361903858178).

638927099806 is a wasteful number, since it uses less digits than its factorization.

638927099806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10710435.

The product of its (nonzero) digits is 70543872, while the sum is 67.

The spelling of 638927099806 in words is "six hundred thirty-eight billion, nine hundred twenty-seven million, ninety-nine thousand, eight hundred six".