138558398507 has 2 divisors, whose sum is σ = 138558398508. Its totient is φ = 138558398506.

The previous prime is 138558398479. The next prime is 138558398509. The reversal of 138558398507 is 705893855831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138558398507 - 2⁶ = 138558398443 is a prime.

Together with 138558398509, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138558398507.

It is not a weakly prime, because it can be changed into another prime (138558398509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69279199253 + 69279199254.

It is an arithmetic number, because the mean of its divisors is an integer number (69279199254).

Almost surely, 2^138558398507 is an apocalyptic number.

138558398507 is a deficient number, since it is larger than the sum of its proper divisors (1).

138558398507 is an equidigital number, since it uses as much as digits as its factorization.

138558398507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288000, while the sum is 62.

The spelling of 138558398507 in words is "one hundred thirty-eight billion, five hundred fifty-eight million, three hundred ninety-eight thousand, five hundred seven".