138636187165 has 16 divisors (see below), whose sum is σ = 190141031808. Its totient is φ = 95059112256.

The previous prime is 138636187147. The next prime is 138636187259. The reversal of 138636187165 is 561781636831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138636187165 - 2¹⁹ = 138635662877 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 521739 + ... + 741271.

It is an arithmetic number, because the mean of its divisors is an integer number (11883814488).

Almost surely, 2^138636187165 is an apocalyptic number.

It is an amenable number.

138636187165 is a deficient number, since it is larger than the sum of its proper divisors (51504844643).

138636187165 is a wasteful number, since it uses less digits than its factorization.

138636187165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237588.

The product of its digits is 4354560, while the sum is 55.

The spelling of 138636187165 in words is "one hundred thirty-eight billion, six hundred thirty-six million, one hundred eighty-seven thousand, one hundred sixty-five".