138773289681 has 12 divisors (see below), whose sum is σ = 215869561908. Its totient is φ = 85398947424.

The previous prime is 138773289653. The next prime is 138773289709. The reversal of 138773289681 is 186982377831.

138773289681 is a `hidden beast` number, since 1 + 387 + 73 + 28 + 96 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (138773289653) and next prime (138773289709).

It can be written as a sum of positive squares in 2 ways, for example, as 15631250625 + 123142039056 = 125025^2 + 350916^2 .

It is not a de Polignac number, because 138773289681 - 2⁷ = 138773289553 is a prime.

It is a super-4 number, since 4×138773289681⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (138773289181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 593048130 + ... + 593048363.

It is an arithmetic number, because the mean of its divisors is an integer number (17989130159).

Almost surely, 2^138773289681 is an apocalyptic number.

It is an amenable number.

138773289681 is a deficient number, since it is larger than the sum of its proper divisors (77096272227).

138773289681 is a wasteful number, since it uses less digits than its factorization.

138773289681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186096512 (or 1186096509 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 138773289681 in words is "one hundred thirty-eight billion, seven hundred seventy-three million, two hundred eighty-nine thousand, six hundred eighty-one".