138155231032 has 256 divisors, whose sum is σ = 342860636160. Its totient is φ = 50641403904.

The previous prime is 138155231017. The next prime is 138155231041. The reversal of 138155231032 is 230132551831.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 311862603 + ... + 311863045.

It is an arithmetic number, because the mean of its divisors is an integer number (1339299360).

Almost surely, 2^138155231032 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 138155231032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171430318080).

138155231032 is an abundant number, since it is smaller than the sum of its proper divisors (204705405128).

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

138155231032 is a wasteful number, since it uses less digits than its factorization.

138155231032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 138155231032 its reverse (230132551831), we get a palindrome (368287782863).

The spelling of 138155231032 in words is "one hundred thirty-eight billion, one hundred fifty-five million, two hundred thirty-one thousand, thirty-two".