138508232161 has 8 divisors (see below), whose sum is σ = 152336386944. Its totient is φ = 125133459600.

The previous prime is 138508232147. The next prime is 138508232167. The reversal of 138508232161 is 161232805831.

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 138508232161 - 2⁹ = 138508231649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138508232167) 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, 113344915 + ... + 113346136.

It is an arithmetic number, because the mean of its divisors is an integer number (19042048368).

Almost surely, 2^138508232161 is an apocalyptic number.

It is an amenable number.

138508232161 is a deficient number, since it is larger than the sum of its proper divisors (13828154783).

138508232161 is a wasteful number, since it uses less digits than its factorization.

138508232161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226691111.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 138508232161 in words is "one hundred thirty-eight billion, five hundred eight million, two hundred thirty-two thousand, one hundred sixty-one".