138175992168 has 32 divisors (see below), whose sum is σ = 349812643200. Its totient is φ = 45475642368.

The previous prime is 138175992167. The next prime is 138175992173. The reversal of 138175992168 is 861299571831.

It is a super-2 number, since 2×138175992168² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138175992167) 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 7 ways as a sum of consecutive naturals, for example, 36436921 + ... + 36440712.

It is an arithmetic number, because the mean of its divisors is an integer number (10931645100).

Almost surely, 2^138175992168 is an apocalyptic number.

It is an amenable number.

138175992168 is an abundant number, since it is smaller than the sum of its proper divisors (211636651032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138175992168 is a wasteful number, since it uses less digits than its factorization.

138175992168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72877721 (or 72877717 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 60.

The spelling of 138175992168 in words is "one hundred thirty-eight billion, one hundred seventy-five million, nine hundred ninety-two thousand, one hundred sixty-eight".