638426040806 has 16 divisors (see below), whose sum is σ = 960497054784. Its totient is φ = 318260544744.

The previous prime is 638426040799. The next prime is 638426040853. The reversal of 638426040806 is 608040624836.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7650101 + ... + 7733103.

It is an arithmetic number, because the mean of its divisors is an integer number (60031065924).

Almost surely, 2^638426040806 is an apocalyptic number.

638426040806 is a deficient number, since it is larger than the sum of its proper divisors (322071013978).

638426040806 is a wasteful number, since it uses less digits than its factorization.

638426040806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94435.

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 638426040806 in words is "six hundred thirty-eight billion, four hundred twenty-six million, forty thousand, eight hundred six".