138888750125 has 8 divisors (see below), whose sum is σ = 173333160312. Its totient is φ = 111111000000.

The previous prime is 138888750071. The next prime is 138888750137. The reversal of 138888750125 is 521057888831.

It can be written as a sum of positive squares in 4 ways, for example, as 157828969 + 138730921156 = 12563^2 + 372466^2 .

It is not a de Polignac number, because 138888750125 - 2¹⁶ = 138888684589 is a prime.

It is a super-2 number, since 2×138888750125² (a number of 23 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 555554876 + ... + 555555125.

It is an arithmetic number, because the mean of its divisors is an integer number (21666645039).

Almost surely, 2^138888750125 is an apocalyptic number.

It is an amenable number.

138888750125 is a deficient number, since it is larger than the sum of its proper divisors (34444410187).

138888750125 is an equidigital number, since it uses as much as digits as its factorization.

138888750125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111110016 (or 1111110006 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 56.

The spelling of 138888750125 in words is "one hundred thirty-eight billion, eight hundred eighty-eight million, seven hundred fifty thousand, one hundred twenty-five".