138205321354 has 4 divisors (see below), whose sum is σ = 207307982034. Its totient is φ = 69102660676.

The previous prime is 138205321351. The next prime is 138205321367. The reversal of 138205321354 is 453123502831.

It is a happy number.

138205321354 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 453123502831 = 35083 ⋅12915757.

It can be written as a sum of positive squares in only one way, i.e., 134742587329 + 3462734025 = 367073^2 + 58845^2 .

It is not an unprimeable number, because it can be changed into a prime (138205321351) 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 as a sum of consecutive naturals, namely, 34551330337 + ... + 34551330340.

Almost surely, 2^138205321354 is an apocalyptic number.

138205321354 is a deficient number, since it is larger than the sum of its proper divisors (69102660680).

138205321354 is an equidigital number, since it uses as much as digits as its factorization.

138205321354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69102660679.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 138205321354 in words is "one hundred thirty-eight billion, two hundred five million, three hundred twenty-one thousand, three hundred fifty-four".