138887512525 has 6 divisors (see below), whose sum is σ = 172220515562. Its totient is φ = 111110010000.

The previous prime is 138887512513. The next prime is 138887512529. The reversal of 138887512525 is 525215788831.

It can be written as a sum of positive squares in 3 ways, for example, as 191600964 + 138695911561 = 13842^2 + 372419^2 .

It is not a de Polignac number, because 138887512525 - 2¹¹ = 138887510477 is a prime.

It is a super-2 number, since 2×138887512525² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138887512529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2777750226 + ... + 2777750275.

Almost surely, 2^138887512525 is an apocalyptic number.

It is an amenable number.

138887512525 is a deficient number, since it is larger than the sum of its proper divisors (33333003037).

138887512525 is an equidigital number, since it uses as much as digits as its factorization.

138887512525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555500511 (or 5555500506 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 55.

The spelling of 138887512525 in words is "one hundred thirty-eight billion, eight hundred eighty-seven million, five hundred twelve thousand, five hundred twenty-five".