138441806165 has 48 divisors (see below), whose sum is σ = 192099755520. Its totient is φ = 95523966720.

The previous prime is 138441806161. The next prime is 138441806197. The reversal of 138441806165 is 561608144831.

It is not a de Polignac number, because 138441806165 - 2² = 138441806161 is a prime.

It is a super-2 number, since 2×138441806165² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138441806161) 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 47 ways as a sum of consecutive naturals, for example, 668534 + ... + 850776.

It is an arithmetic number, because the mean of its divisors is an integer number (4002078240).

Almost surely, 2^138441806165 is an apocalyptic number.

It is an amenable number.

138441806165 is a deficient number, since it is larger than the sum of its proper divisors (53657949355).

138441806165 is a wasteful number, since it uses less digits than its factorization.

138441806165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182334 (or 182321 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 138441806165 in words is "one hundred thirty-eight billion, four hundred forty-one million, eight hundred six thousand, one hundred sixty-five".