138520663 has 2 divisors, whose sum is σ = 138520664. Its totient is φ = 138520662.

The previous prime is 138520661. The next prime is 138520693. The reversal of 138520663 is 366025831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138520663 - 2¹ = 138520661 is a prime.

Together with 138520661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138520661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69260331 + 69260332.

It is an arithmetic number, because the mean of its divisors is an integer number (69260332).

Almost surely, 2^138520663 is an apocalyptic number.

138520663 is a deficient number, since it is larger than the sum of its proper divisors (1).

138520663 is an equidigital number, since it uses as much as digits as its factorization.

138520663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 138520663 is about 11769.4801499472. The cubic root of 138520663 is about 517.4140138901.

The spelling of 138520663 in words is "one hundred thirty-eight million, five hundred twenty thousand, six hundred sixty-three".