138144544321 has 16 divisors (see below), whose sum is σ = 164804650240. Its totient is φ = 113320658880.

The previous prime is 138144544309. The next prime is 138144544327. The reversal of 138144544321 is 123445441831.

It is a cyclic number.

It is not a de Polignac number, because 138144544321 - 2⁹ = 138144543809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138144544327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4356141 + ... + 4387738.

It is an arithmetic number, because the mean of its divisors is an integer number (10300290640).

Almost surely, 2^138144544321 is an apocalyptic number.

It is an amenable number.

138144544321 is a deficient number, since it is larger than the sum of its proper divisors (26660105919).

138144544321 is an equidigital number, since it uses as much as digits as its factorization.

138144544321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8743984.

The product of its digits is 184320, while the sum is 40.

The spelling of 138144544321 in words is "one hundred thirty-eight billion, one hundred forty-four million, five hundred forty-four thousand, three hundred twenty-one".