138759006565 has 4 divisors (see below), whose sum is σ = 166510807884. Its totient is φ = 111007205248.

The previous prime is 138759006479. The next prime is 138759006569. The reversal of 138759006565 is 565600957831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 97823196289 + 40935810276 = 312767^2 + 202326^2 .

It is a cyclic number.

It is not a de Polignac number, because 138759006565 - 2¹⁹ = 138758482277 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 (138759006569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13875900652 + ... + 13875900661.

It is an arithmetic number, because the mean of its divisors is an integer number (41627701971).

Almost surely, 2^138759006565 is an apocalyptic number.

It is an amenable number.

138759006565 is a deficient number, since it is larger than the sum of its proper divisors (27751801319).

138759006565 is an equidigital number, since it uses as much as digits as its factorization.

138759006565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27751801318.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 138759006565 in words is "one hundred thirty-eight billion, seven hundred fifty-nine million, six thousand, five hundred sixty-five".