138535906559 has 4 divisors (see below), whose sum is σ = 138540177504. Its totient is φ = 138531635616.

The previous prime is 138535906543. The next prime is 138535906577. The reversal of 138535906559 is 955609535831.

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 138535906559 - 2⁴ = 138535906543 is a prime.

It is a super-2 number, since 2×138535906559² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138535906498 and 138535906507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138535906459) 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, 2086442 + ... + 2151815.

It is an arithmetic number, because the mean of its divisors is an integer number (34635044376).

Almost surely, 2^138535906559 is an apocalyptic number.

138535906559 is a deficient number, since it is larger than the sum of its proper divisors (4270945).

138535906559 is an equidigital number, since it uses as much as digits as its factorization.

138535906559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270944.

The product of its (nonzero) digits is 21870000, while the sum is 59.

The spelling of 138535906559 in words is "one hundred thirty-eight billion, five hundred thirty-five million, nine hundred six thousand, five hundred fifty-nine".