138426979667 has 2 divisors, whose sum is σ = 138426979668. Its totient is φ = 138426979666.

The previous prime is 138426979651. The next prime is 138426979681. The reversal of 138426979667 is 766979624831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138426979667 - 2⁴ = 138426979651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138426979597 and 138426979606.

It is not a weakly prime, because it can be changed into another prime (138426979967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69213489833 + 69213489834.

It is an arithmetic number, because the mean of its divisors is an integer number (69213489834).

Almost surely, 2^138426979667 is an apocalyptic number.

138426979667 is a deficient number, since it is larger than the sum of its proper divisors (1).

138426979667 is an equidigital number, since it uses as much as digits as its factorization.

138426979667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164602368, while the sum is 68.

The spelling of 138426979667 in words is "one hundred thirty-eight billion, four hundred twenty-six million, nine hundred seventy-nine thousand, six hundred sixty-seven".