138384748340581 has 6 divisors (see below), whose sum is σ = 146051493401382. Its totient is φ = 131101340532840.

The previous prime is 138384748340513. The next prime is 138384748340689. The reversal of 138384748340581 is 185043847483831.

It can be written as a sum of positive squares in only one way, i.e., 137800951488225 + 583796852356 = 11738865^2 + 764066^2 .

It is not a de Polignac number, because 138384748340581 - 2³¹ = 138382600856933 is a prime.

It is a super-2 number, since 2×138384748340581² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138384748370581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191668626150 + ... + 191668626871.

It is an arithmetic number, because the mean of its divisors is an integer number (24341915566897).

Almost surely, 2^{138384748340581} is an apocalyptic number.

It is an amenable number.

138384748340581 is a deficient number, since it is larger than the sum of its proper divisors (7666745060801).

138384748340581 is an equidigital number, since it uses as much as digits as its factorization.

138384748340581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383337253059 (or 383337253040 counting only the distinct ones).

The product of its (nonzero) digits is 247726080, while the sum is 67.

The spelling of 138384748340581 in words is "one hundred thirty-eight trillion, three hundred eighty-four billion, seven hundred forty-eight million, three hundred forty thousand, five hundred eighty-one".