138820908601 has 4 divisors (see below), whose sum is σ = 138821670400. Its totient is φ = 138820146804.

The previous prime is 138820908587. The next prime is 138820908623. The reversal of 138820908601 is 106809028831.

138820908601 is digitally balanced in base 2, 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 a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 106809028831 = 241 ⋅443190991.

It is a cyclic number.

It is not a de Polignac number, because 138820908601 - 2⁹ = 138820908089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138820908301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71740 + ... + 531778.

It is an arithmetic number, because the mean of its divisors is an integer number (34705417600).

Almost surely, 2^138820908601 is an apocalyptic number.

It is an amenable number.

138820908601 is a deficient number, since it is larger than the sum of its proper divisors (761799).

138820908601 is an equidigital number, since it uses as much as digits as its factorization.

138820908601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761798.

The product of its (nonzero) digits is 165888, while the sum is 46.

The spelling of 138820908601 in words is "one hundred thirty-eight billion, eight hundred twenty million, nine hundred eight thousand, six hundred one".