138785918279 has 2 divisors, whose sum is σ = 138785918280. Its totient is φ = 138785918278.

The previous prime is 138785918269. The next prime is 138785918281. The reversal of 138785918279 is 972819587831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138785918279 - 2¹⁶ = 138785852743 is a prime.

It is a super-2 number, since 2×138785918279² (a number of 23 digits) contains 22 as substring.

Together with 138785918281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138785918269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69392959139 + 69392959140.

It is an arithmetic number, because the mean of its divisors is an integer number (69392959140).

Almost surely, 2^138785918279 is an apocalyptic number.

138785918279 is a deficient number, since it is larger than the sum of its proper divisors (1).

138785918279 is an equidigital number, since it uses as much as digits as its factorization.

138785918279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 68.

The spelling of 138785918279 in words is "one hundred thirty-eight billion, seven hundred eighty-five million, nine hundred eighteen thousand, two hundred seventy-nine".