138686043768535 has 8 divisors (see below), whose sum is σ = 166423741763616. Its totient is φ = 110948508853920.

The previous prime is 138686043768533. The next prime is 138686043768653. The reversal of 138686043768535 is 535867340686831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138686043768535 - 2¹ = 138686043768533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138686043768533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38891331 + ... + 42307300.

It is an arithmetic number, because the mean of its divisors is an integer number (20802967720452).

Almost surely, 2^{138686043768535} is an apocalyptic number.

138686043768535 is a deficient number, since it is larger than the sum of its proper divisors (27737697995081).

138686043768535 is an equidigital number, since it uses as much as digits as its factorization.

138686043768535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81540233.

The product of its (nonzero) digits is 2090188800, while the sum is 73.

The spelling of 138686043768535 in words is "one hundred thirty-eight trillion, six hundred eighty-six billion, forty-three million, seven hundred sixty-eight thousand, five hundred thirty-five".