138225867517 has 2 divisors, whose sum is σ = 138225867518. Its totient is φ = 138225867516.

The previous prime is 138225867503. The next prime is 138225867529. The reversal of 138225867517 is 715768522831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129552484356 + 8673383161 = 359934^2 + 93131^2 .

It is a cyclic number.

It is not a de Polignac number, because 138225867517 - 2¹⁹ = 138225343229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138225817517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69112933758 + 69112933759.

It is an arithmetic number, because the mean of its divisors is an integer number (69112933759).

Almost surely, 2^138225867517 is an apocalyptic number.

It is an amenable number.

138225867517 is a deficient number, since it is larger than the sum of its proper divisors (1).

138225867517 is an equidigital number, since it uses as much as digits as its factorization.

138225867517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5644800, while the sum is 55.

The spelling of 138225867517 in words is "one hundred thirty-eight billion, two hundred twenty-five million, eight hundred sixty-seven thousand, five hundred seventeen".