138766517479 has 2 divisors, whose sum is σ = 138766517480. Its totient is φ = 138766517478.

The previous prime is 138766517473. The next prime is 138766517497. The reversal of 138766517479 is 974715667831.

Together with next prime (138766517497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (974715667831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138766517479 - 2³ = 138766517471 is a prime.

It is a super-2 number, since 2×138766517479² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138766517479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138766517471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69383258739 + 69383258740.

It is an arithmetic number, because the mean of its divisors is an integer number (69383258740).

Almost surely, 2^138766517479 is an apocalyptic number.

138766517479 is a deficient number, since it is larger than the sum of its proper divisors (1).

138766517479 is an equidigital number, since it uses as much as digits as its factorization.

138766517479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53343360, while the sum is 64.

The spelling of 138766517479 in words is "one hundred thirty-eight billion, seven hundred sixty-six million, five hundred seventeen thousand, four hundred seventy-nine".