138785918269 has 2 divisors, whose sum is σ = 138785918270. Its totient is φ = 138785918268.

The previous prime is 138785918203. The next prime is 138785918279. The reversal of 138785918269 is 962819587831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123001011225 + 15784907044 = 350715^2 + 125638^2 .

It is a cyclic number.

It is not a de Polignac number, because 138785918269 - 2⁹ = 138785917757 is a prime.

It is a super-2 number, since 2×138785918269² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138785918279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69392959134 + 69392959135.

It is an arithmetic number, because the mean of its divisors is an integer number (69392959135).

Almost surely, 2^138785918269 is an apocalyptic number.

It is an amenable number.

138785918269 is a deficient number, since it is larger than the sum of its proper divisors (1).

138785918269 is an equidigital number, since it uses as much as digits as its factorization.

138785918269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52254720, while the sum is 67.

The spelling of 138785918269 in words is "one hundred thirty-eight billion, seven hundred eighty-five million, nine hundred eighteen thousand, two hundred sixty-nine".