138005104681 has 16 divisors (see below), whose sum is σ = 141993584640. Its totient is φ = 134064113040.

The previous prime is 138005104673. The next prime is 138005104703. The reversal of 138005104681 is 186401500831.

It is a cyclic number.

It is not a de Polignac number, because 138005104681 - 2³ = 138005104673 is a prime.

It is a super-2 number, since 2×138005104681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138005104681.

It is not an unprimeable number, because it can be changed into a prime (138005104381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3511900 + ... + 3550978.

It is an arithmetic number, because the mean of its divisors is an integer number (8874599040).

Almost surely, 2^138005104681 is an apocalyptic number.

It is an amenable number.

138005104681 is a deficient number, since it is larger than the sum of its proper divisors (3988479959).

138005104681 is a wasteful number, since it uses less digits than its factorization.

138005104681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39684.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 138005104681 in words is "one hundred thirty-eight billion, five million, one hundred four thousand, six hundred eighty-one".