16813117538 has 16 divisors (see below), whose sum is σ = 30517928064. Its totient is φ = 6781761600.

The previous prime is 16813117513. The next prime is 16813117591. The reversal of 16813117538 is 83571131861.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35321438 + ... + 35321913.

It is an arithmetic number, because the mean of its divisors is an integer number (1907370504).

Almost surely, 2^16813117538 is an apocalyptic number.

16813117538 is a deficient number, since it is larger than the sum of its proper divisors (13704810526).

16813117538 is a wasteful number, since it uses less digits than its factorization.

16813117538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70643377.

The product of its digits is 120960, while the sum is 44.

The spelling of 16813117538 in words is "sixteen billion, eight hundred thirteen million, one hundred seventeen thousand, five hundred thirty-eight".