138252504385 has 4 divisors (see below), whose sum is σ = 165903005268. Its totient is φ = 110602003504.

The previous prime is 138252504367. The next prime is 138252504449. The reversal of 138252504385 is 583405252831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583405252831 = 3407 ⋅171237233.

It can be written as a sum of positive squares in 2 ways, for example, as 59711320881 + 78541183504 = 244359^2 + 280252^2 .

It is a cyclic number.

It is not a de Polignac number, because 138252504385 - 2²³ = 138244115777 is a prime.

It is a super-2 number, since 2×138252504385² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13825250434 + ... + 13825250443.

It is an arithmetic number, because the mean of its divisors is an integer number (41475751317).

Almost surely, 2^138252504385 is an apocalyptic number.

It is an amenable number.

138252504385 is a deficient number, since it is larger than the sum of its proper divisors (27650500883).

138252504385 is an equidigital number, since it uses as much as digits as its factorization.

138252504385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27650500882.

The product of its (nonzero) digits is 1152000, while the sum is 46.

The spelling of 138252504385 in words is "one hundred thirty-eight billion, two hundred fifty-two million, five hundred four thousand, three hundred eighty-five".