138461645489 has 6 divisors (see below), whose sum is σ = 144743459826. Its totient is φ = 132441573440.

The previous prime is 138461645477. The next prime is 138461645549. The reversal of 138461645489 is 984546164831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 130742265889 + 7719379600 = 361583^2 + 87860^2 .

It is not a de Polignac number, because 138461645489 - 2⁴ = 138461645473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138461645429) 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 in 5 ways as a sum of consecutive naturals, for example, 130870592 + ... + 130871649.

It is an arithmetic number, because the mean of its divisors is an integer number (24123909971).

Almost surely, 2^138461645489 is an apocalyptic number.

It is an amenable number.

138461645489 is a deficient number, since it is larger than the sum of its proper divisors (6281814337).

138461645489 is an equidigital number, since it uses as much as digits as its factorization.

138461645489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261742287 (or 261742264 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 59.

The spelling of 138461645489 in words is "one hundred thirty-eight billion, four hundred sixty-one million, six hundred forty-five thousand, four hundred eighty-nine".