138441856725 has 132 divisors (see below), whose sum is σ = 259375756032. Its totient is φ = 73299492000.

The previous prime is 138441856697. The next prime is 138441856771. The reversal of 138441856725 is 527658144831.

It is a happy number.

138441856725 is a `hidden beast` number, since 1 + 3 + 8 + 44 + 18 + 567 + 25 = 666.

138441856725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138441856725 - 2⁶ = 138441856661 is a prime.

It is a super-2 number, since 2×138441856725² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 131 ways as a sum of consecutive naturals, for example, 281958730 + ... + 281959220.

Almost surely, 2^138441856725 is an apocalyptic number.

138441856725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138441856725 is a deficient number, since it is larger than the sum of its proper divisors (120933899307).

138441856725 is an frugal number, since it uses more digits than its factorization.

138441856725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 690 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 54.

The spelling of 138441856725 in words is "one hundred thirty-eight billion, four hundred forty-one million, eight hundred fifty-six thousand, seven hundred twenty-five".