16442805138 has 32 divisors (see below), whose sum is σ = 33737812416. Its totient is φ = 5340711168.

The previous prime is 16442805121. The next prime is 16442805173. The reversal of 16442805138 is 83150824461.

It is a happy number.

It is a super-3 number, since 3×16442805138³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16442805138.

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, 189795 + ... + 262502.

It is an arithmetic number, because the mean of its divisors is an integer number (1054306638).

Almost surely, 2^16442805138 is an apocalyptic number.

16442805138 is an abundant number, since it is smaller than the sum of its proper divisors (17295007278).

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

16442805138 is a wasteful number, since it uses less digits than its factorization.

16442805138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452458.

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 16442805138 in words is "sixteen billion, four hundred forty-two million, eight hundred five thousand, one hundred thirty-eight".