138528725369 has 2 divisors, whose sum is σ = 138528725370. Its totient is φ = 138528725368.

The previous prime is 138528725353. The next prime is 138528725411. The reversal of 138528725369 is 963527825831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138523907344 + 4818025 = 372188^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 138528725369 - 2⁴ = 138528725353 is a prime.

It is a super-2 number, since 2×138528725369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138528725669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69264362684 + 69264362685.

It is an arithmetic number, because the mean of its divisors is an integer number (69264362685).

Almost surely, 2^138528725369 is an apocalyptic number.

It is an amenable number.

138528725369 is a deficient number, since it is larger than the sum of its proper divisors (1).

138528725369 is an equidigital number, since it uses as much as digits as its factorization.

138528725369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21772800, while the sum is 59.

The spelling of 138528725369 in words is "one hundred thirty-eight billion, five hundred twenty-eight million, seven hundred twenty-five thousand, three hundred sixty-nine".