138751320125 has 24 divisors (see below), whose sum is σ = 190334724216. Its totient is φ = 100910040000.

The previous prime is 138751320107. The next prime is 138751320131. The reversal of 138751320125 is 521023157831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27874973764 + 110876346361 = 166958^2 + 332981^2 .

It is not a de Polignac number, because 138751320125 - 2²⁶ = 138684211261 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

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, 4571696 + ... + 4601945.

It is an arithmetic number, because the mean of its divisors is an integer number (7930613509).

Almost surely, 2^138751320125 is an apocalyptic number.

It is an amenable number.

138751320125 is a deficient number, since it is larger than the sum of its proper divisors (51583404091).

138751320125 is an equidigital number, since it uses as much as digits as its factorization.

138751320125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9173678 (or 9173657 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

Adding to 138751320125 its reverse (521023157831), we get a palindrome (659774477956).

The spelling of 138751320125 in words is "one hundred thirty-eight billion, seven hundred fifty-one million, three hundred twenty thousand, one hundred twenty-five".