138579478561 has 16 divisors (see below), whose sum is σ = 151809603840. Its totient is φ = 125914727680.

The previous prime is 138579478517. The next prime is 138579478673. The reversal of 138579478561 is 165874975831.

It is a cyclic number.

It is not a de Polignac number, because 138579478561 - 2²³ = 138571089953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138579478493 and 138579478502.

It is not an unprimeable number, because it can be changed into a prime (138579478361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6401646 + ... + 6423256.

It is an arithmetic number, because the mean of its divisors is an integer number (9488100240).

Almost surely, 2^138579478561 is an apocalyptic number.

It is an amenable number.

138579478561 is a deficient number, since it is larger than the sum of its proper divisors (13230125279).

138579478561 is a wasteful number, since it uses less digits than its factorization.

138579478561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34664.

The product of its digits is 50803200, while the sum is 64.

The spelling of 138579478561 in words is "one hundred thirty-eight billion, five hundred seventy-nine million, four hundred seventy-eight thousand, five hundred sixty-one".