138395781441 has 8 divisors (see below), whose sum is σ = 205030787360. Its totient is φ = 92263854276.

The previous prime is 138395781439. The next prime is 138395781451. The reversal of 138395781441 is 144187593831.

138395781441 is a `hidden beast` number, since 1 + 38 + 3 + 95 + 7 + 81 + 441 = 666.

It is not a de Polignac number, because 138395781441 - 2¹ = 138395781439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138395781451) 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, 2562884815 + ... + 2562884868.

It is an arithmetic number, because the mean of its divisors is an integer number (25628848420).

Almost surely, 2^138395781441 is an apocalyptic number.

It is an amenable number.

138395781441 is a deficient number, since it is larger than the sum of its proper divisors (66635005919).

138395781441 is an equidigital number, since it uses as much as digits as its factorization.

138395781441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125769692 (or 5125769686 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 138395781441 in words is "one hundred thirty-eight billion, three hundred ninety-five million, seven hundred eighty-one thousand, four hundred forty-one".