138195023161 has 8 divisors (see below), whose sum is σ = 152455298184. Its totient is φ = 124453303680.

The previous prime is 138195023159. The next prime is 138195023201. The reversal of 138195023161 is 161320591831.

It can be written as a sum of positive squares in 4 ways, for example, as 19056145936 + 119138877225 = 138044^2 + 345165^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138195023161 - 2¹ = 138195023159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138195023861) 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, 129638326 + ... + 129639391.

It is an arithmetic number, because the mean of its divisors is an integer number (19056912273).

Almost surely, 2^138195023161 is an apocalyptic number.

It is an amenable number.

138195023161 is a deficient number, since it is larger than the sum of its proper divisors (14260275023).

138195023161 is a wasteful number, since it uses less digits than its factorization.

138195023161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259277771.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 138195023161 in words is "one hundred thirty-eight billion, one hundred ninety-five million, twenty-three thousand, one hundred sixty-one".