138579478559 has 4 divisors (see below), whose sum is σ = 138634846416. Its totient is φ = 138524110704.

The previous prime is 138579478517. The next prime is 138579478673. The reversal of 138579478559 is 955874975831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138579478559 - 2²⁸ = 138311043103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138579478492 and 138579478501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138579477559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27680174 + ... + 27685179.

It is an arithmetic number, because the mean of its divisors is an integer number (34658711604).

Almost surely, 2^138579478559 is an apocalyptic number.

138579478559 is a deficient number, since it is larger than the sum of its proper divisors (55367857).

138579478559 is an equidigital number, since it uses as much as digits as its factorization.

138579478559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55367856.

The product of its digits is 381024000, while the sum is 71.

The spelling of 138579478559 in words is "one hundred thirty-eight billion, five hundred seventy-nine million, four hundred seventy-eight thousand, five hundred fifty-nine".