138387838008557 has 4 divisors (see below), whose sum is σ = 145671408430080. Its totient is φ = 131104267587036.

The previous prime is 138387838008517. The next prime is 138387838008569. The reversal of 138387838008557 is 755800838783831.

It is a happy number.

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.

It is not a de Polignac number, because 138387838008557 - 2¹⁶ = 138387837943021 is a prime.

It is a super-2 number, since 2×138387838008557² (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 (138387838008517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3641785210733 + ... + 3641785210770.

It is an arithmetic number, because the mean of its divisors is an integer number (36417852107520).

Almost surely, 2^{138387838008557} is an apocalyptic number.

It is an amenable number.

138387838008557 is a deficient number, since it is larger than the sum of its proper divisors (7283570421523).

138387838008557 is an equidigital number, since it uses as much as digits as its factorization.

138387838008557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7283570421522.

The product of its (nonzero) digits is 1083801600, while the sum is 74.

The spelling of 138387838008557 in words is "one hundred thirty-eight trillion, three hundred eighty-seven billion, eight hundred thirty-eight million, eight thousand, five hundred fifty-seven".