138825538081 has 2 divisors, whose sum is σ = 138825538082. Its totient is φ = 138825538080.

The previous prime is 138825537947. The next prime is 138825538151. The reversal of 138825538081 is 180835528831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118628580625 + 20196957456 = 344425^2 + 142116^2 .

It is a cyclic number.

It is not a de Polignac number, because 138825538081 - 2⁹ = 138825537569 is a prime.

It is a super-2 number, since 2×138825538081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138825532081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69412769040 + 69412769041.

It is an arithmetic number, because the mean of its divisors is an integer number (69412769041).

Almost surely, 2^138825538081 is an apocalyptic number.

It is an amenable number.

138825538081 is a deficient number, since it is larger than the sum of its proper divisors (1).

138825538081 is an equidigital number, since it uses as much as digits as its factorization.

138825538081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1843200, while the sum is 52.

The spelling of 138825538081 in words is "one hundred thirty-eight billion, eight hundred twenty-five million, five hundred thirty-eight thousand, eighty-one".