809913423638 has 16 divisors (see below), whose sum is σ = 1337471712720. Its totient is φ = 364765010400.

The previous prime is 809913423577. The next prime is 809913423677. The reversal of 809913423638 is 836324319908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168870293 + ... + 168875088.

It is an arithmetic number, because the mean of its divisors is an integer number (83591982045).

Almost surely, 2^809913423638 is an apocalyptic number.

809913423638 is a deficient number, since it is larger than the sum of its proper divisors (527558289082).

809913423638 is a wasteful number, since it uses less digits than its factorization.

809913423638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337745503.

The product of its (nonzero) digits is 6718464, while the sum is 56.

The spelling of 809913423638 in words is "eight hundred nine billion, nine hundred thirteen million, four hundred twenty-three thousand, six hundred thirty-eight".