138109766388 has 72 divisors (see below), whose sum is σ = 356014191456. Its totient is φ = 41638914240.

The previous prime is 138109766371. The next prime is 138109766411. The reversal of 138109766388 is 883667901831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44631 + ... + 527457.

It is an arithmetic number, because the mean of its divisors is an integer number (4944641548).

Almost surely, 2^138109766388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138109766388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178007095728).

138109766388 is an abundant number, since it is smaller than the sum of its proper divisors (217904425068).

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

138109766388 is a wasteful number, since it uses less digits than its factorization.

138109766388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483053 (or 483040 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 60.

The spelling of 138109766388 in words is "one hundred thirty-eight billion, one hundred nine million, seven hundred sixty-six thousand, three hundred eighty-eight".